Nepal; agriculture in the Khumbu, 1986. Pangboche (altitude 4200 metres), showing the tiny, walled terraced fields on which Sherpas cultivate their staple crops (potatoes, barley, wheat). Potatoes are rarely grown beyond 4000 metres but barley is grown at higher altitudes. Scattered juniper and birch trees share this terrain with sub-alpine grasses. Few people live permanently beyond this village amid the last scattered trees below the treeline.