Mediumfjellet  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 8 kilometer. The highest peak is Gavltinden to the north. The mountain is located between the glaciers Sveabreen and Wahlenbergbreen.