| Lake Zaysan | |
|---|---|
| Зайсан көлі (Kazakh) | |
 | |
  Lake Zaysan | |
| Coordinates | 48°00′N 84°00′E / 48.000°N 84.000°E |
| Lake type | Ancient lake |
| Primary inflows | Kara Irtysh (Black Irtysh), Kendyrlyk |
| Primary outflows | Irtysh River (White Irtysh) |
| Basin countries | Kazakhstan |
| Max. length | 105 km (65 mi) |
| Max. width | 48 km (30 mi) |
| Surface area | 1,810 km2 (700 sq mi) |
| Max. depth | 15 m (49 ft) |
| Surface elevation | 420 m (1,380 ft) |
Lake Zaysan or Zaisan, also known by other names in other languages, is a freshwater lake in Tarbagatay District, East Kazakhstan Region, Kazakhstan. It is the largest lake in the region. The lake is generally frozen from the beginning of November to the end of April, but still has an abundance of fish.
The lake has been drying in the modern era, but that process has been stabilized by the construction of the Bukhtarma Hydroelectric Power Plant, of whose reservoir it's now a part.