Wellesley, a province of the British colony of the Straits Settlements, comprising a part of the W. coast of the Malay peninsula, between the Quedah and Perak rivers, and the island of Penang opposite to it (see Penang); area, 343 sq. m.; pop. in 1871, 133,230. The mainland portion of the province (area, 236 sq. m., pop. 71,433) is bounded N. by the native state of Quedah, ruled by an independent rajah, E. by Siam, and W. by the strait of Malacca. On the south, between it and the British province of Malacca, are several native states, called respectively Larut, Perak, Klang, Salangore, Sunjie, Ujong, and Rumbowe, all of which have lately been brought under British supremacy. Several of them, especially Larut, are very rich in tin, gold, galena, and other minerals, and contribute largely to the commerce of Penang. The surface of Wellesley is undulating, with extensive alluvial tracts and a few sandy strips. The climate is hot, averaging 80°, and more rain falls than in Penang, but the country is not considered unhealthful. The soil is remarkably fertile, the vegetable products being similar to those of Penang. The elephant, tiger, rhinoceros, and many other wild animals abound.

A large part of the province is under cultivation, chiefly by Chinese and Europeans, and sugar, rice, and tapioca are raised in considerable quantities. The inhabitants are principally Chinese and Malays. The British have constructed good roads into the interior, which is also accessible by several rivers, of which the Perak is the largest. - Wellesley was settled by the English in 1800. In 1873-'4 much trouble was experienced from the depredations of pirates belonging to the coast states, but after ships had been sent to the coast, and troops into the interior, peace was established, and the whole coast will probably be annexed to the Straits Settlements.