Chomoutovské jezero, Protected lake near Olomouc, Czech Republic.

Chomoutovské Lake is a flooded gravel and sand pit of 85 hectares, at most two metres deep, lying at 220 m in the Hornomoravský úval on the right bank of the Oskava. It consists of two water surfaces, Velké and Malé; the triangular larger one holds two wooded islands in its south, and a local road runs along the western shore.

The lake formed from extraction operations for gravel and sand that started before World War II and expanded significantly during the 1960s. These mining activities gradually created the present water body.

Local residents have long protested the high level of bird protection here, preferring a natural swimming area instead. The lake is also used for recreation and fishing, and the European beaver, once extinct in the area, was reintroduced; gnaw marks on shoreline trees show its activity.

The lake lies 10 km north of Olomouc city centre and 2.5 km north of the Oskava–Morava confluence, on the right bank of the Oskava. A local road and the Olomouc–Pňovice road run along the western shore. The shores are overgrown, so there is no observation platform and no embankment; the site is used for recreation and fishing.

European beavers, once extinct in the area, were reintroduced here, and gnaw marks on the shoreline trees show where they have been working. The lake is also a nesting site for Mediterranean and black-headed gulls.