The Annapurna Sanctuary trek also known as the Annapurna Base Camp trek is famous for trekkers. The principal peaks of the western portion of the great Annapurna Himal, including Hiunchuli, Annapurna South, Fang, Annapurna, Ganagapurna, Annapurna 3 and Machhapuchhare, are arranged almost precisely in a circle about 10 miles in diameter with a deep glacier-covered amphitheatre at the centre. From this glacier basin, known as the Annapurna Sanctuary, the Modi Khola knifes its way south in a narrow gorge fully 3660m deep. Further south, the gorge opens up into a wide and fertile valley, the domain of the Gurungs. The middle and upper portions of Modi Khola offer some of the best short trekking routes in Nepal, and the valley is located so that these treks can be easily combined with treks into the Kali Gandaki region to the west.