Rosohan is a hidden alpine lake tucked away on the southern slopes of the Arshytsia ridge in the Gorgany massif of the Ukrainian Carpathians — and it comes with a mystery. No one knows for certain whether this lake was formed by a landslide or by a meteorite impact, making every visit feel like a small expedition into the unknown.

Sitting at 1120 m above sea level, the lake is compact but captivating: 50–70 m long, 20 m wide, with a maximum depth of 2.8 m — rising to 4.5 m after prolonged rain. The water is crystal clear, the bottom and banks are rocky, and the surrounding mountain forest keeps the place feeling remote and wild. In spring the mist drifts through the trees, summer brings mirror-like reflections of the sky, and autumn wraps everything in golden calm.

How to get there:

• Starting point in the Mshana river valley (Kalush district, Ivano-Frankivsk region) — trail details not fully documented, difficulty: moderate.

Practical information:

• Rosohan has been a protected hydrological nature monument of local significance since 1972.
• An information board was installed at the site in 2007 by the 'Carpathian Trails' organisation with support from the Embassy of the Netherlands in Ukraine.

Rosohan is a closed, endorheic lake with no surface outlet — a rare feature in the Carpathians that adds to its ecological uniqueness and the lingering question of how it came to be.