Black Lake Durmitor: the glacial lake walk everyone can do

Durmitor’s most accessible wonder

Crno Jezero — the Black Lake — sits at 1,416 metres above sea level in a glacially carved depression beneath Durmitor’s karst peaks. Its name comes not from the water colour, which ranges from clear turquoise to deep blue-green depending on depth and light, but from the dense black pine forest (Pinus nigra) that crowds its shores. Seen from the air, the forest canopy is so uniform and dark that the lake looks set in polished obsidian.

This is one of those rare natural sights that requires almost no effort to reach but delivers outsized reward. The circular walk around the main lake is 3.6 km and takes barely an hour. Children who can walk a kilometre can complete it. And yet the lake manages to feel genuinely wild — the reflections of the Medjed and Šljeme peaks, the silence of the deep forest, and the occasional marmot call from the rocky slopes above all conspire to produce a sense of proper mountain solitude.

Žabljak, the small highland town 1.5 km from the lake, is the gateway and the overnight base for anyone spending more than a day in Durmitor National Park.

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The geology: how Durmitor’s lakes formed

Durmitor holds 18 glacial lakes, locally called gorske oči — “mountain eyes.” They were all created during the last Ice Age (approximately 20,000–15,000 years ago), when glaciers advancing from the main Durmitor massif carved hollows in the karst limestone. When the glaciers retreated, these hollows filled with meltwater to form the lakes we see today.

Crno Jezero is the largest and lowest of them, sitting in the most easily accessible of Durmitor’s glacier-carved valleys. It’s actually two lakes connected by a narrow isthmus: Veliko Jezero (the Large Lake, about 514 metres long) and Malo Jezero (the Small Lake, about 250 metres long). Together they cover roughly 5 hectares with a maximum depth of 49 metres in the larger basin.

The clarity of the water — visibility to several metres even near the shore — reflects the purity of the snowmelt and springs that feed the lake. There is no significant development on the lakeshores; no hotels, no piers, no motorised boats. The National Park designation has preserved it well.

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The main circular walk (3.6 km, 1 hour)

The standard trail circles Veliko Jezero and is well-maintained with clear waymarking. The path is mostly soft forest floor with some root sections near the water; proper footwear is advisable but trail shoes or sturdy trainers are sufficient.

Trailhead: The car park below the lake, about 1.5 km from Žabljak centre by road. Follow the main road west from Žabljak; the lake parking is clearly signed.

The route: From the car park, the path descends to the lakeshore and immediately divides into a clockwise and anticlockwise option. Both are equally good; most walkers go clockwise (left, hugging the northern shore first). The northern shore path follows the water’s edge under black pine forest, with frequent views across the lake to the peaks behind. The southern shore is slightly more open, with a small meadow section near the isthmus.

The isthmus: At the point where Veliko Jezero narrows to meet Malo Jezero, a small stone bridge connects the shores. This is the most photographed section of the walk — the bridge frames a view of both lakes simultaneously, with pine-covered slopes rising on both sides.

Total elevation gain: Minimal — under 30 metres. This is a lakeside walk, not a climb.

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The upper lake extension: Malo Jezero (add 1–1.5 hours)

Malo Jezero (the Small Lake) lies on the far side of the isthmus from the car park. A trail continues around its perimeter — smaller, quieter, with fewer visitors — and then climbs steeply up the valley behind it toward the lower slopes of the Medjed peak.

The extension from the isthmus to the head of the valley behind Malo Jezero is marked but requires proper hiking boots and a reasonable level of fitness (about 300 metres of ascent from the lake). The views from the upper valley back down to the two lakes are exceptional and worth the extra effort for walkers who want more than a flat circuit.

Most families and casual walkers are satisfied with the main Veliko Jezero circuit. The Malo Jezero extension suits those combining the lake walk with an afternoon of more serious hiking. For those who prefer water to walking, the contrast between this glacial lake and the warm, wildlife-rich Skadar Lake in the south is one of the more striking geographic juxtapositions Montenegro offers.

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Swimming: cold, clean, and worth it

Swimming is permitted in both lakes. In July and August, water temperature in the shallows reaches 12–15 °C — cold enough to take your breath away initially, warm enough to swim for several minutes if you’re reasonably cold-tolerant. The water clarity is remarkable up close: you can see the pebbly bottom at 4–5 metres depth from the surface.

The best entry points are the small gravel and rock sections on the northern shore of Veliko Jezero where the path approaches the water, and the shallow bay at the isthmus. There are no sandy beaches; wear swim shoes if you find rocky entries uncomfortable.

Early morning (before 10 am) is the best time to swim: the lake is glassy, the light is low and soft, and you’ll often have the shore to yourself.

Cold-water swimmers in training: the 15 °C maximum in summer means this is a genuine cold-dip venue. Those who swim regularly in the sea at 22 °C will find it bracingly different.

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Mlinski Potok: the mill stream trail

Between Žabljak and the lake, the Mlinski Potok (Mill Stream) runs through a shaded valley with several old mill ruins. A 1 km path follows the stream from the edge of town to the lakeside car park, through birch and pine forest. Walkers who prefer not to use the road can take this trail in both directions — it’s flat, beautiful, and usually cooler than the road by several degrees.

Look for the trail access point on the western edge of Žabljak near the petrol station. The path is signed but not always obvious at the start; once in the trees, it’s straightforward.

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Wildlife and plants

The forest around Crno Jezero is ecologically important beyond its scenic value. It contains:

• Pinus nigra (Austrian black pine) — the dominant species that gives the lake its name
• Pinus sylvestris (Scots pine) — mixed into the upper reaches of the forest
• Brown bears — present in Durmitor but extremely rare near the lake itself; mostly in the higher, more remote sections of the park
• Eurasian otter — occasionally seen at the lake margins at dusk
• Brown trout and grayling — the lake is a protected fishing zone; no fishing without park permission
• Alpine swift — nesting on the upper cliff faces visible from the southern shore

The meadow sections between the forest contain typical alpine flora: gentians, mountain pansies (Viola alpina), and — in late May to early June — spectacular displays of yellow and white flowers in the short grass around the isthmus.

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Getting there

From Žabljak centre: 1.5 km by road or the Mlinski Potok trail. Walking takes 20 minutes.

From Kotor: 2h30–3h via Nikšić and Šavnik. A good mountain road; some sections near Durmitor are unpaved in a small stretch but manageable.

From Podgorica: 2h15 via Nikšić.

From Sarajevo (Bosnia): 3h via Foča and Šćepan Polje.

There is no public transport connection to Crno Jezero directly. Žabljak is served by a daily bus from Podgorica; from the bus station in Žabljak, the lake is within walking distance or a short taxi ride.

For those building an itinerary from the south, combining Crno Jezero with Skadar Lake and a stop at Njeguši for pršut creates a logical north-south traverse of the country’s inland highlights in 3–4 days.

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National Park entrance fee

Durmitor National Park charges an entrance fee for vehicles entering the park zone (which includes the road to the lake). In 2025/2026, the fee was approximately €6–8 per person or €10–12 per vehicle for a day pass. Fees are collected at a small booth on the road from Žabljak to the lake. The fee is well worth it — the park is maintained to a high standard with clean paths, minimal litter, and well-signed trails.

Annual passes are available for those spending more than 2–3 days in the park.

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What to bring

For the main circular walk (1 hour):

• Comfortable trainers or walking shoes (no specialist hiking boots needed)
• Water (500ml minimum; there are no facilities on the trail)
• Sunscreen (the open sections catch significant UV at 1,400m altitude)
• Light windproof layer (the lake creates a microclimate that’s cooler than Žabljak by 2–3 °C)

If swimming:

• Swimsuit, small towel, swim shoes for rocky entry
• Dry bag for phone and valuables

For the Malo Jezero extension:

• Proper hiking boots and poles
• Lunch (no facilities beyond Žabljak; a small snack bar near the car park operates in July–August only)

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Combining Crno Jezero with other activities

Durmitor National Park packs a remarkable density of activities around a small highland town:

Day 1: Arrive Žabljak, afternoon Black Lake walk and swim, dinner in town
Day 2: Full-day Tara River rafting — the take-out is 45 minutes from Žabljak
Day 3: Hiking to a higher lake (Vražje Jezero, Devil’s Lake) or the Bobotov Kuk summit (2,523 m, Montenegro’s highest accessible peak). Those who want to extend the food dimension can drive south to Njeguši for pršut tasting on the way back to the coast.

The Vražje Jezero (Devil’s Lake) in Durmitor’s northern section is accessible on a guided small-group walk and offers a harder, more remote version of the glacial lake experience.

Žabljak: Durmitor NP & Vražje Jezero Small Group Tour

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Frequently asked questions

Can children do the Black Lake walk?

Yes. The circular trail is flat, well-maintained, and 3.6 km long. Children who can walk 2–3 km without assistance can complete it comfortably. The only sections requiring care are a few root-covered areas near the water and the narrow stone bridge at the isthmus. Children aged 4 and above typically manage it without difficulty.

Is there a café or restaurant at the lake?

A small seasonal snack bar operates near the main car park in July and August. It sells coffee, cold drinks, and simple snacks. For a full meal, return to Žabljak — the town has several good restaurants within walking distance of the lake trail.

What time should I arrive to avoid crowds?

Arrive by 8:00–9:00 am on weekends in July and August. By 11 am the car park is often full and the trail is busy. Weekdays in June and September are quieter throughout the day.

Is Crno Jezero the same as Black Lake in Durmitor National Park?

Yes. Crno Jezero translates directly to Black Lake. It is sometimes called Durmitor Black Lake in English-language literature to distinguish it from other lakes in the region with similar names.

Can I fish in Crno Jezero?

Fishing is regulated in the National Park. A specific permit is required; recreational fishing without one is not allowed. The lake contains brown trout and grayling. Ask at the National Park visitor centre in Žabljak for current permit regulations.

Is the trail open in winter?

The trail is technically accessible year-round, but in winter the path becomes icy and snow-covered (Žabljak regularly records Montenegro’s heaviest snowfall — 2–3 metres of snow is not unusual). Winter visits are beautiful but require appropriate footwear and an awareness that conditions can change quickly.

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Žabljak town: eating, sleeping and logistics

Žabljak is one of those towns that exists almost entirely to support outdoor activities, and it does its job without pretension. The main street has a handful of restaurants, a supermarket, a pharmacy, a small tourist office, and more outdoor equipment shops per capita than any other town in Montenegro. Accommodation runs from budget hostels to mid-range mountain guesthouses; in summer, prices are reasonable compared to the coast (€40–80 per night for a double).

Where to eat:
The local speciality is lamb prepared in the traditional manner: roasted in a sač (covered metal dome with embers placed on top) for several hours until falling off the bone. Several restaurants on or near the main square serve this from Friday through Sunday when supply allows. Order in advance if you want it.

Fish lovers should note that the lake trout and grayling from streams near Žabljak occasionally appear on menus, though supply is erratic. Mountain cheeses — drier, saltier, and more pungent than the coastal varieties — are reliably available.

What to buy:
Local cheese and cured meat from the small market that operates near the town centre on summer mornings. Durmitor honey (the high-altitude wildflower version) is sold from private houses and worth seeking out.

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Beyond Crno Jezero: Durmitor’s other lakes

Crno Jezero is the most accessible of Durmitor’s 18 glacial lakes, but experienced walkers will find the others equally or more rewarding. A few within reach of a day walk:

Šarenko jezero (Rainbow Lake): 2 hours from Žabljak on a signed trail through beech and pine forest. Smaller and more enclosed than Crno Jezero, named for the light effects on its surface in late morning. No facilities; fewer visitors.

Zminje jezero (Snake Lake): 3.5 hours from Žabljak, at 1,820 metres. A high-altitude basin with views back to the Crno Jezero valley and the Bobotov Kuk ridge. Requires proper hiking boots and navigation skills on the upper trail.

Vražje jezero (Devil’s Lake): The most dramatic of the upper Durmitor lakes, in a steep-sided glacial cirque on the north face of the massif. Accessible on a guided small-group walk from Žabljak, or as a long self-guided hike for very experienced mountain walkers.

Žabljak: Durmitor NP & Vražje Jezero Small Group Tour

The National Park visitor centre in Žabljak has detailed maps of all lake routes with current trail conditions. This is worth visiting before any of the higher-altitude walks, particularly in May–June when snow patches on north-facing slopes can make route-finding difficult.

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Durmitor in a wider Montenegro itinerary

Crno Jezero and the Durmitor plateau represent the northern extreme of a classic Montenegro road trip. The natural route:

Kotor (base) → Lovćen National Park and Njeguši pršut tasting → Cetinje → Skadar Lake boat tour from Virpazar → Podgorica → Plantaže winery visit → north via Nikšić → Žabljak and Durmitor (2 nights minimum)

This north–south structure covers the country’s main geographical and cultural zones in a logical sequence. Durmitor at the end of the trip provides the counterpoint to the coastal Venetian heritage at the start: you arrive in Kotor surrounded by sea and baroque architecture; you leave from Žabljak surrounded by glacial lakes and 2,500-metre peaks.

The road from Nikšić to Žabljak passes through the Piva Canyon — a reservoir formed by the Piva River behind a large dam — which adds another spectacular drive to the sequence. Allow 2h30 from Podgorica to Žabljak; the scenery in the final hour through the canyon earns its reputation.