Annapurna (; Sanskrit, Nepali, Newar: अन्नपूर्ण) is a massif in the Himalayas in north-central Nepal that includes one peak over 8,000 metres (26,000 ft), thirteen peaks over 7,000 metres (23,000 ft), and sixteen more over 6,000 metres (20,000 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 conquered on the first try.The entire massif and surrounding area are protected within the 7,629-square-kilometre (2,946 sq mi) Annapurna Conservation Area, the first and largest conservation area in Nepal. The Annapurna Conservation Area is home to several world-class treks, including Annapurna Sanctuary and Annapurna Circuit. Historically, the Annapurna peaks have been among the world's most treacherous mountains to climb with the particular case of the extremely steep south face of Annapurna I Main - a wall of rock that rises 3,000 meters (9,800 feet) - making it one of the most difficult climbs in the world. By March 2012, there had been 191 summit ascents of Annapurna I Main, and 61 climbing fatalities on the mountain. This fatality-to-summit ratio (1:3.1, or 32%) is the highest of any of the eight-thousanders. In October 2014, at least 43 people were killed as a result of snowstorms and avalanches on and around Annapurna, thus resulting in Nepal's worst ever trekking disaster. The most recent report of human casualty has been that of January 17, 2020, due to an avalanche triggered by heavy snowfall.