De Geerdalen is a valley in Nordenskiöld Land at Spitsbergen, Svalbard. It is named after Swedish geologist and Arctic explorer Gerard De Geer.[1] The mountain pass of Kreklingpasset divides De Geerdalen from Helvetiadalen.[2] The river of De Geerelva flows through the valley, and debouches into Sassenfjorden at Elveneset.[3]