Lake Burtnieks is the fourth biggest lake in Latvia. It is a lake of running water. The lake ground mainly is sandly, in places a little muddy.

unruffed surface: 4006 hectares
capacity: 88,1 million cubic miles
maximum depth: 3,3 m
middle depth: 2,2 m
maximum length: 13,3 km
maximum width: 5,5 km
banks descrption: shallow, sandly, in the South and Southeast in places steep till 35 m high hillock, there are sandstone, outcrop.
island numbers: 3
island engaged area:1,4 hectares

In the Southeast part of the lake there is sandstone rock.
The lake is rich in fish, there are duck hunting places.