Annapurnais a massif in the Himalayas in north-central Nepal that includes one peak over 8,000 metres (26,247 ft), thirteen peaks over 7,000 metres (22,966 ft), and sixteen more over 6,000 metres (19,685 ft). The massif is 55 kilometres (34 mi) long, and is bounded by the Kali Gandaki Gorge on the west, the Marshyangdi River on the north and east, and by Pokhara Valley on the south. At the western end, the massif encloses a high basin called the Annapurna Sanctuary. The highest peak of the massif, Annapurna I Main, is the tenth highest mountain in the world at 8,091 metres (26,545 ft) above sea level. Maurice Herzog led a French expedition to its summit through the north face in 1950, making it the first of the eight-thousanders to be climbed and the only 8,000 meter-peak to be summited with a safe descent on the first try.