What mountain range that starts with J is located southeast of Interlaken and is one of Switzerland's taller mountain groups?
I think you mean the Jungfrau (4158 metres). The Jungfrau is a mountain, not a mountain range. The Jungfrau is next to two other mountains, the Eiger (3970 m) and Mönch (…4107 m). All three are part of the Bernese Alps. (MORE)