The lake Šmartinsko jezero was created in 1970. It can be reached from various directions and spreads on 113 ha of water surfaces - that makes it one of the largest artificial lakes in Slovenia. The average depth is somewhere between 4 and 6m and it was measured in the vicinity of the peninsula Brezova. The water near the dam and the barrier is between 8 and 9m deep.
The lake is home to carps, white grass carps, grey silver carps, tenches, common rudds, roaches, bleaks, common breams, silver breams, catfish, zanders and pikes.