Trang (Thai: ตรัง, pronounced [trāŋ]), also called Mueang Thap Thiang, is one of the southern provinces (changwat) of Thailand, on the west side of the Malay Peninsula facing the Andaman Sea. Neighboring provinces are (from north clockwise) Krabi, Nakhon Si Thammarat, Phatthalung, and Satun.
Trang was formerly a port involved in foreign trade. It was the first place where rubber was planted in Thailand. Phraya Ratsadanupradit Mahison Phakdi brought rubber saplings from Malaya and planted them here in 1899, and rubber is now an important export of the country. The Trang River flows through the province from its origin in the Khao Luang mountain range, and the Palian River flows from the Banthat mountains. The province of Trang has an area of approximately 5,000 square km and 199 km of Andaman Sea shoreline.
The province is on the coast of the Andaman Sea, and contains 46 islands together with the mainland area. There are only few plains, and most of the area is hills. The Khao Luang and the Banthat mountain range are the sources of the two main rivers of the province, the Trang River and the Palian River. It has a long western coastline of about 199 kilometres.