Věstonická nádrž, Nature reserve in Dolní Věstonice, Czech Republic.

Věstonická nádrž is the middle reservoir of the Nové Mlýny waterworks, built on the Dyje river and bordered by villages including Dolní Věstonice and Strachotín. Its 1,024-hectare surface, with an average depth of two metres, holds 24 islands, including the church island with the church of St Linhart.

The Nové Mlýny reservoirs were built on the Dyje in the 1970s and 1980s, flooding wetlands, floodplain forests and the village of Mušov. The middle reservoir was declared a nature reserve in 1994 as compensation for lost habitats, and in 2005 it became a Natura 2000 bird area.

The reservoir takes its name from the nearby village of Dolní Věstonice, reflecting the deep connection between the community and this landscape. Today, visitors come to observe the rich wildlife that congregates along the shores, especially during seasonal migrations.

The middle reservoir is bordered by embankments of broken stone, with the southern and eastern dams surfaced in asphalt; roads I/52 and II/420 run along its western and eastern sides. The water level is held at 170 m above sea level, and the reserve covers 1024 ha, 97% of it open water. The 24 islands, several of them artificial, are nesting grounds and should be viewed from the shore.

The site has held international recognition as an Important Bird Area since 2010, where thousands of migratory birds rest during their seasonal journeys. This status makes it one of central Europe's most valuable stopover points for migrating species.