an island in the bay of Bengal, situate 10 miles from the coast of Arracan, between Long. 18° 40', 18° 56'; Lat. 39° 31', 93° 50'. It extends about 20 miles in length from north to south, and 17 miles from east to west, and has an area of 250 square miles. The channel between the island and the mainland is navigable for boats, but not for large vessels. The geology of Cheduba affords various indications of a volcanic nature. Along the coast are earthy cones covered with a greensward, from which issue springs of muddy water emitting bubbles of gas. Among the mineral productions, copper, iron, and silver ore have been discovered. The island is also noted for its petroleum wells, the oil derived from which is of excellent quality; it possesses a strong pungent smell, and is extensively used in the composition of paint, as it possesses the property of preserving wood from the ravages of insects, especially the white ant. Timber is not abundant. The gamboge tree, prized for the valuable properties of its gum, is found of a good size; as is also the wood-oil tree. Tobacco, cotton, sugar-cane, hemp, and indigo are among the productions of Cheduba; but the staple article is rice, which is of superior quality, and the chief article of export. The inhabitants are of the Mugh persuasion. Cheduba fell to the Burmese in the latter part of the last century. From them it was captured in 1824 by the British, to whom it was confirmed in 1826 by the treaty concluded with the Burmese at Yandaboo.