Thandwe (Burmese formerly Sandoway) is a town and major seaport in Rakhine State, the westernmost part of Myanmar. Thandwe is very ancient, and is said to have been at one time the capital of Rakhine State, then called Arakan. The district has an area of 3,784 square miles (9,800 km2). The country is mountainous, the Arakan Mountains sending out spurs which reach the coast. Some of the peaks in the north attain 4,000 and more ft. The streams are only mountain torrents to within a few miles of the coast; the mouth of the Khwa forms a good anchorage for vessels of from 9 to 10 ft (3.0 m) draught. The rocks in the Arakan Range and its spurs are metamorphic, and comprise clay, slates, ironstone and indurated sandstone; towards the south, ironstone, trap and rocks of basaltic character are common; veins of steatite and white fibrous quartz are also found. Between 1961 and 1990, the mean annual rainfall was 5,323 millimetres (209.6 in). Except a few acres of tobacco, all the cultivation is rice.