The Ciernovazska dolina is the longest valley in Low Tatras, measures more than 35 km. The area is famous especially for its riches of wild animals and precious florae. The valley crosses the Cierny Vah river which rises under Cralova Hola mountain and ends in the Biely Vah river. Both of them constitude the great slovak river Vah. The one and only village in the whole valley is Liptovska Teplicka from which a lot of signed touristic paths start.
In 1982 the building of the Cierny Vah water-dam was finished and become the highest draw power-station in Slovakia with output of 665 MW.