Ørsdalsvatnet or Ørdalsvatnet is a lake in the municipality of Bjerkreim in Rogaland county, Norway.[1] The 12.39-square-kilometre (4.78 sq mi) lake lies about 2 kilometres (1.2 mi) northeast of the village of Bjerkreim. The lake is rather narrow, but it is 17 km (11 mi) long.