The waters of Lake Rāzna are an impressive part of what is known as the Land of Blue Lakes, or the Latgale Sea. It is the largest lake in Latvia in terms of volume of water, and the second largest in area.

There are ten islands on Lake Rāzna, the largest being Apaļa sala (Round), Apšu (Aspen) or Lielā (Great), Augstā (High) and Ezītis (Hedgehog). The islands are located in two of the most conspicuous coves of the lake – Zosnagala and Dukstigala. The lake bed is sandy in the east and south, clayey in the northern part, but muddy in the western part. On its shores, waves splash overhanging roots and branches. More than 20 streams and channels flow into Lake Rāzna, but the Rēzekne river is the only outflow. A magnificent view of the lake opens up from the peak of Mākoņkalns.

• Since 1949, Lake Rāzna’s water level has been artificially regulated.
• The lake is home to 24 species of fish, including rarities such as whitefish, vendace and lake smelt.
• A cycle track runs around the lake.