CHUMBI VALLEY, a valley connecting Tibet (q.v.) with the frontier of British India. Lying on the southern slopes of the Himalayas at an altitude of about 9,500 ft. above the sea, the valley is wedged in between Bhutan and Sikkim, and does not belong geographically but only politically to Tibet. This was the route by which the British mission of 1904 advanced. The valley is of great natural beauty, but only sparsely cultivated on small flats by the river. The summer months, though not hot, are relaxing and enervating.