Nemrut Dağı (3050m), rising to the north of Tatvan, is an inactive volcano with several crater lakes. On the crater rim (13km from the main road) are sensational views over Lake Van, Tatvan, and nearby water-filled craters. From the rim you can hike to the summit (about 45 minutes) – just follow the lip of the crater (the last stretch is a bit of a scramble). Midweek, the only company will be shepherds with their flocks and sturdy sheep dogs.
Follow the dirt road leading down to the lake from the crater rim and find your own picnic area.Visits are only possible from around mid-May to the end of October; at other times the summit is under snow.
A taxi from Tatvan is around TL150 return. On summer weekends hitching is an option.
With your own transport, leave Tatvan heading to Bitlis, and turn right at a sign saying 'Nemrut 13km'. At the time of writing, this previously rough road was being resealed for improved access. You'll then reach the crater rim, from where a dirt road winds down into the crater and connects with other dirt roads snaking around the crater.
Guided trips can be undertaken with Alkans Tours in Van.