Storglaciaren in Sweden
Storglaciaren in northern Sweden is a type of geological formation called a polythermal valley glacier. Below the frozen upper surface, the ice is at the temperature of water.
This unusual glacier has been studied intensely since 1947 when Tarfala Research Station was built and Swedish glaciologist Walter Schytt began his formal observations of the ice. The station is operated by the Department of Physical Geography at Stockholm University.