Tovdalselva or Topdalselva (literally: the Tov valley river) is 143 kilometres (89 mi) long and is one of the longest rivers in Southern Norway. The river flows from the northeast to the southwest and reaches the sea at the Topdalsfjorden between Hamresanden and Kjevik. The upper reaches of the river include many lakes such as the Herefossfjorden and the Straumsfjorden (the largest lake on the river). It drains about 1,800 square kilometres (690 sq mi) in territory and the highest point is 1,101 metres (3,612 ft) above sea level.