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Agriculture is possible at heights of 3,800 to 4,180 metres (12,470 to 13,710 ft) (villages of Shimen Panzang Valley and Chharka, respectively) but often requires irrigation.^[1]^:22 Apart from barley, crops include buckwheat, millet, mustard, wheat, potatoes, radishes,^[1]^:22 and spinach. Similar to transhumance in the Alps, the population migrates between villages and high-lying (4,000 to 5,000 metres or 13,000 to 16,000 feet) summer pastures, in a lifestyle referred to as samadrok (roughly "farming nomads").^[1]^{:44, 50}