| Western Region | |
| Other Name: | ภาคตะวันตก |
| Settlement Type: | Region |
| Parts Type: | Provinces |
| Parts Style: | coll |
| P2: | Phetchaburi Province |
| P3: | Prachuap Khiri Khan Province |
| P4: | Ratchaburi Province |
| P5: | Tak Province |
| Subdivision Type1: | Largest city |
| Subdivision Name1: | Hua Hin |
| Unit Pref: | metric |
| Area Total Km2: | 53,769 |
| Population As Of: | 2018 |
| Population Total: | 3,430,314 |
| Population Density Km2: | auto |
| Blank1 Info Sec2: | Thai • others |
| Demographics Type2: | GDP |
| Demographics2 Footnotes: | [1] |
| Demographics2 Title1: | Total |
| Demographics2 Info1: | US$19.3 billion (2019) |
| Demographics2 Title2: | Per capita |
Western Thailand is a region of Thailand bordering Myanmar on the west, Southern Thailand on the south, and central Thailand on the east.
Thailand's long mountainous border with Myanmar continues south from northern Thailand into western Thailand following the Tenasserim Hills. This 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.
The geography of the western region is characterised by high mountains and steep river valleys. Western Thailand hosts much of Thailand's less-disturbed forest areas. Water and minerals are important natural resources. The region is home to many of the country's major dams, and mining is an important industry. Many village names in western Thailand rely heavily on the physical geography of the region.[2]
According to the six geographical regions established by the National Research Council of Thailand, the western region includes the following provinces:
For economic statistics of Western Thailand, Suphan Buri and Samut Songkhram provinces are listed by National Statistical Office (Thailand). However Tak Province is listed by (lower) Northern Thailand.
For FY 2018, Western Thailand Region had a combined economic output of 579.815 billion baht (US$18.7 billion), or 3.5 percent of Thailand's GDP. Ratchaburi province had an economic output of 189.68 billion baht (US$6.12 billion). 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]
| Rank | Province | GPP (million baht) | Population (x 1000) | GPP per capita (baht) | |
|---|---|---|---|---|---|
| 1 | Ratchaburi | 189,680 | 813 | 233,258 | |
| 2 | Prachuap Khiri Khan | 93,381 | 488 | 191,306 | |
| 3 | Phetchaburi | 72,035 | 499 | 144,392 | |
| 4 | Samut Songkhram | 25,974 | 182 | 142,808 | |
| 5 | Kanchanaburi | 107,144 | 829 | 129,304 | |
| 6 | Suphan Buri | 91,602 | 854 | 107,228 | |
| Western region | 579,815 | 3,665 | 158,206 |
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).[4]