Orava (Slovak: Oravská priehrada) is a reservoir in northernmost Slovakia, forming the largest lake in Slovakia (35.2 km2).
The reservoir was created by the construction of a dam between 1941 and 1953 on the former two sources of the Orava river. Several former villages had to be inundated for this purpose, including Hámre, Osada, and Ústie. The most notable of these is Slanica, the remains of which form a large island in the reservoir – the Slanica Island, which today hosts a museum exhibition. The reservoir is currently protected by the Horná Orava Protected Landscape Area.
The average depth of the reservoir is 15 meters.
