The lake is two kilometres from the village of Pigniu. It is about 1.5 kilometers long and about 250 meters wide. It is fed by some unnamed mountain streams. An easy-to-walk hiking or walking trail. It takes about an hour to circumstrate. On the west side, several large waterfalls plunge into the valley.
Lake Urdensee is situated on 2'249 m asl in a side valley of the middle Schanfigg between the municipalities of Arosa and Vaz/Obervaz, as well as the alp region Urder Augstberg. It is surrounded by the mountains Plattenhorn, Hörnli, Hörnligrat, Tschirpen, Parpaner Weisshorn and Parpaner Schwarzhorn.
The dreamy Lai Pintg (Romanesque for small lake) is located in the Area Anarosa behind the Alp Nurdagn (agritourism offer with food and overnight accommodation) at 2312 m. above .M. on the mountain hiking trail towards Farcletta digl Lai Pintg and SAC-Cufercalhütte.