Storakersvatnet (Norwegian), Akersvatnet (Norwegian), or Aagkelsjaevrie (Southern Sami) is a lake in Rana Municipality in Nordland county, Norway. The lake lies about 15 kilometres (9.3 mi) south of the town of Mo i Rana and less than 900 metres (0.6 mi) from the border with Sweden. The original lake was only 15.9 square kilometres (6.1 sq mi), but a dam was built at the northern end so that it can serve as a reservoir for the Rana power station. This dam has caused the lake to enlarge to an area of 42.3 square kilometres (16.3 sq mi).