The narrow region stretches from Bangkok's outer reaches to the border with Myanmar and from the Shan Hills in the north to Chumphon Province in the south.

Western Thailand is home to many of the country's major dams, and mining is an important industry.

This amounts to a GPP per capita of 233,258 baht (US$7,524), more than double for Suphan Buri province, lowest in the ranking.

[3] Kanchanaburi, Ratchaburi, Suphan Buri, and Samut Songkhram Provinces have been added to the central region by the Thai Meteorological Department (TMD).

Petchaburi and Prachuap Khiri Khan Provinces are part of the southern region (east coast).