Its cliffs are so close to each other that at some points they prevent the light from getting in. It is one of the biggest climbing challenges in this part of Europe. It was conquered in 1965 for the first time. Before that no one had ever seen in its entirety. There is a huge waterfall – Grabovine a couple hundred meters before the entrance. Mountaineers usually go to conquest it in late summer because water is not high. For this adventure you need full climbing equipment including diving suits. On the way through the three and a half kilometres long canyon you will come across waterfalls, straits, cascades, white water, narrow channels and a whole gallery of nature-made sculptures. The hardest challenge is the so-called Gate of Kamikazes – section about 80 meters long and in some parts only 25 centimetres wide. Those who decide to take this alpine adventure must know that once you get in and start going down the galleries, cascades and waterfalls you cannot go back - you have to go all the way to the end.
Many visitors, travel writers and scientists were amazed with the beauty of this lake and picturesque scenery around it. Deep Pošćensko Lake is one of the 18 mountain lakes belonging to the National Park Durmitor. Those 18 glacial lakes lie at an altitude of over 1,500 meters and significantly contribute to the beauty of the impressive mount Durmitor. All these lakes are specific and different by their origin, size and amount of water, by their shape and beauty of the landscapes surrounding them. These Durmitor lakes, including Pošćensko, were born after the glaciations in the last Ice Age, during the time of ice melting. Local people as well as many visitors call them “mountain eyes”. Such a large number of beautiful lakes on a relatively small space among others impressed Jovan Cvijić (a famous Serbian scientist, Honorary Doctor of the Sorbonne University and Charles University in Prague who was into physical and social geography, geomorphology, ethnography, geology, anthropology, and history) who visited almost all of them during his stay in Durmitor in 1899.
Park area amounts 39.000 hectares, stretched on the territory of five municipalities: Žabljak, Šavnik, Plužine, Mojkovac and Pljevlja.Main feature of the relief is a wide plateau located at 1.500 meters above the sea level, carved by deep canyon valleys, with impressive mountain tops, of which 48 are at 2.000 meters above the sea level. The highest peak is Bobotov kuk, at 2.525 meters above the sea level. Particular impression is created by 18 glacial lakes, called "mountain eyes", located at 1.500 meters above the sea level. The biggest and the most beautiful is Crno Lake, with stunning scenery, and a giant peak Medvjed, above the lake.With the decision of UNESCO’s International Committee for the World Natural and Historical Heritage from 1980, NP Durmitor was included in the list of the World Natural Heritage.Center of the park is Žabljak, small town at the bottom of the southeastern part of Durmitor. This settlement, which is located at the highest altitude of the Balkan Peninsula (around 1.450m) is the biggest winter center in Montenegro, with considerable accommodation capacities, both hotel and private, infrastructure for winter sports and services in the area of tourism and mountaineering. Mountaineering paths are marked and there is an organized mountain climbing guide service.In the National park zone, you can conquer whirlpools, defiles, limans and spinning wheels with rafts, kayaks and pneumatic boats, carried by the mainstream of the river Tara and guided by secure hands of rafters, discover the beauty, pass through the deepest canyon in Europe and swim in perfectly clean water.Length of the river Tara is 156 kilometers, canyon valley is 93 kilometers long, while the canyon depth can reach even 1.300 meters.