Trang or Muang Thap Thiang used to be a port involved in foreign trade. It was the first city where rubber was planted. Phraya Ratsadanupradit Mahison Phakdi brought rubber from Malaysia and planted it here before anywhere else in southern Thailand in 1899. Rubber is now considered an important commodity of Thailand. The important Trang River flows through the province from its origin in the Khao Luang mountain range and the Palian River from the Banthat mountain range.