Crno Jezero, or Black Lake, is a stunning glacial lake located in Durmitor National Park, Montenegro. It's a popular hiking destination offering breathtaking views and relatively easy trails suitable for most fitness levels. The main trail around the lake is generally accessible, though some parts may be uneven. Visiting solo is perfectly safe and enjoyable, but guided tours are available for those wanting to learn more about the area's history and ecology. The best time to visit is during the warmer months (May-September) as snow can make access difficult in winter. Expect to spend around 2-4 hours exploring the lake and surrounding trails. The cost is primarily the Durmitor National Park entrance fee, which is quite affordable. Be sure to wear comfortable shoes and bring water and snacks.