Mediumfjellet is a mountain northwest of Yoldiabukta in Oscar II Land at Spitsbergen, Svalbard. It constitutes the southern part of the ridge Jämtlandryggen, and has several peaks and a length of 8km (05miles). The highest peak is Gavltinden to the north. The mountain is located between the glaciers Sveabreen and Wahlenbergbreen.[1]