| Slapy Reservoir | |
|---|---|
 Southern part of the reservoir | |
  Slapy Reservoir | |
| Coordinates | 49°44′13″N 14°23′46″E / 49.73694°N 14.39611°E |
| Type | reservoir |
| Primary inflows | Vltava |
| Primary outflows | Vltava |
| Catchment area | 12.96 km2 (5.00 sq mi) |
| Basin countries | Czech Republic |
| Max. length | 43 km (27 mi) |
| Surface area | 11.63 km2 (4.49 sq mi) |
| Average depth | 20 km2 (7.7 sq mi) |
| Max. depth | 53 km2 (20 sq mi) |
| Water volume | 269.3×106 m3 (218,300 acre⋅ft) |
| Surface elevation | 271 m (889 ft) |
Slapy Reservoir (Czech: vodní nádrž Slapy) is a reservoir in the Central Bohemian Region of the Czech Republic. With an area of 11.63 km2 (4.49 sq mi), it is the sixth largest reservoir in the country. Built on the Vltava River, it is part of the so-called Vltava Cascade.