Ultar SAR (also Ultar, Ultar II, Bojohagur Duanasir II) is the southeastern most major peak of the Batura Muztagh, a subrange of the Karakorum Range. It lies about 10 km (6 miles) northeast of the Karimabad, a town on the Karakorum Highway in the Hunza Valley, part of the Gilgit District of the Northern Areas of Pakistan.
The first two ascents were made in July 1996 by two separate Japanese expeditions, the first (from the Tokai section of the Japanese Alpine Club) led by Akito Yamazaki (who summitted, but died on the descent) and the second led by Ken Takahashi. The first summit team comprised Yamazaki and Kiyoshi Matsuoka (who died one year later on the nearby peak Bublimotin). They climbed the peak from the southwest in alpine style, doing much of the climbing at night to avoid danger from falling rock and ice. After their successful summit, they faced strong storms and bivouaced several days without food before returning to base camp. However, Akihito Yamazaki died at base camp of an internal disease due to the severe stress of climbing.
The second summit team comprised Takahashi and four others: Masayuki Ando, Ryushi Hoshino, Wataru Saito, and Nobuo Tsutsumi. They climbed the south ridge. Since 1996, there have been no recorded ascents of the peak.