| Sværsvann | |
| Location: | Oslo, Norway |
| Coordinates: | 59.8169°N 10.8897°W |
| Type: | lake |
| Outflow: | Hobølelva |
| Pushpin Map: | Norway |
| Pushpin Map Alt: | Location of the lake in Norway. |
Sværsvann is a lake in the southeast of Oslo, Norway. The lake drains off into the river Hobølelva. The lake's surrounding areas are mostly residential. Sværsvann is a popular bathing place, and the name is believed to origin from "Sværd Vandet", which means "Sword Water", because a sword was once found at the bottom of the lake.[1] The bottom water contains huge amount of salts, organic nutrition and hydrogen sulfid.[2]