Subregions- Arunachal Pradesh-Assam region, India
 - Cambodia
- Cambodia-Vietnam border region
- China-Laos border region
- Gulf of Tongking
- Hainan, China
- Kepulauan Anambas region, Indonesia
- Kepulauan Natuna Selatan region, Indonesia
- Kepulauan Tambelan region, Indonesia
- Laos
- Laos-Cambodia border region
- Laos-Vietnam border region
- Laos-Vietnam-Cambodia border region
- Manipur, India region
- Myanmar
- Myanmar-Bangladesh border region
- Myanmar-China border region
- Myanmar-India border region
- Myanmar-Thailand border region
- Natuna Besar region, Indonesia
- near the south coast of Myanmar
- South China Sea
- Thailand
- Thailand-Cambodia border region
- Thailand-Laos border region
- Thailand-Laos-Cambodia border region
- Vietnam
- Xizang-Yunnan border region
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