In winter time it is frozen and there is always a thick layer of snow on top of it. In summer time you can swim in it particularly if you have taken the marked trail through the wood to the peak of the mount Visitor if you start your trip from the village of Brezojevice (municipality of Plav). Water temperature reaches 18 degrees. Special curiosity of the lake is a former “floating island”. The legend says that shepherds made it when they made a raft. They would take the raft over night to take their cattle to the shore. Over time the raft got covered with grass and was connected to the mainland with fallen pine trees.
Hydrography: glacial lakes (Hridsko, Visitorsko, Ropojansko, Tatarijsko, Bjelajsko, the Vizier Brady pond, the pond Treskavac, Koljindarsko et al.), large and small streams, springs and sources of drinking water and mineral water, rivers, underground aquifers and mountain ponds .Hridsko Ridsko-Lake:Altitude 1970 mArea of 33-36000 feet, depending on water levelsMaximum depth of 4 mClimate: continental, mountainous and subalpine. The winters are long and very sharp and short summers and fresh. Mean annual air temperature of 2-7 ° C. Maximum rainfall takes place in the late fall and winter, the first portion. Snow cover has an average depth of 15cm and is kept from 90 - 210 days.Relief is indented with numerous peaks, gorges, steep slopes, river valleys, alpine type and other natural phenomena. Among these, the following zones: Karanfilsko-Bjelički (most rugged part of the area, with numerous peaks over 2,000 meters above sea level); Visitorsko; Zone Bogićevica; Zone Bora and Kofiljaće; Elderly Zavojska-zone.Reserves : Hridsko Lake Volušnica
Water withdraws and stands still in winter months and there is no surface spillover. Water of Oko is very cold because of the melted snow from the high parts of Prokletije and on the surface it is about 5°C and in the deeper parts 4.3°C. It is too cold to drink and before use it must be left to warm up.
It is easy to get there, but it is hard to leave it. However, apart from the restaurant there are two mountain lodges where you can stay if you change your mind. The valley of Grebaja is a starting point for hiking and mountain climbing expeditions.This is the source of endless inspiration.
Even though there is an asphalt/macadam road from the city of Plav, it is better not to go by car all the way because the road can be severely damaged by snow. This is not one of those lakes that can make you feel uncomfortable. Even though it is surrounded by conifers, it is not dark because of their reflection in water. It is 300 metres long and 160 metres wide. In summer it is about five metres deep and during the year it is even deeper because of intensive rainfall and snow melting. In winter time it freezes and is covered by a thick layer of ice.There is no fish in the lake, but in July there are many tritons - alpine newts which will freely come to your feet as soon as you step inside. In July water is warm and you can swim in the lake and enjoy silence and beauty of the open skies. This is probably why this lake is believed to bring health and happiness.
Grlja is actually part of the river Skakaivca downstream from the waterfall, and after its merging with waters from Ali-Pasha’s springs it is called Vruja after which it flows towards the city of Gusinje.
Today there is a long wooden quay that hosts lots of people in summer months. Jumps in the clean and warm water are organized there. And its beauty - it is undisputable, as well as its unpredictability.In the course of just one hour, the lake will hide and reveal (if it wants, of course) all of its nuances from pale green to the colour of blueberries or the colour of grey steel under the clouds.
The mountain range Prokletije, unlike the Dinarides, takes another direction, and in some way they are a barrier to the coastal mountains. They rise in the direction Southwest – Northeast starting from a margin of the Skadar-Zeta plain ending up with the complex of highest massifs of Bogicevica all the way to the passes of Čakor and Rugova, about 70 km long, where the highest mountain peaks rise.This powerful complex of high mountains continues in geological and morphological sense to the North with a series of high mountain ranges such as Nedžinat (2,341 m), Čakor (2,046 m), Mokra planina (1,932 m), Haila (2403 m) and Mokra gora (2,154 m).The highest mountain peak of the mountain range Prokletije is Zla Kolata – 2,536 m.