Map of Ko Samui, Thailand

Ko Samui is a city in Surat Thani, Thailand, with a population of about 50,000. It lies at 9.5357°N, 99.9357°E. Ko Samui is about 473 km (294 mi) south of Bangkok, the capital. The nearest city on our map is Surat Thani, 79 km to the southwest.

Ko Samui at a glance

Where is Ko Samui?

• Located in the Northern and Eastern hemispheres.
• Daylight ranges from about 11 h 34 min on the shortest day to 12 h 41 min on the longest day (around 21 December and 21 June).

Cities near Ko Samui

• Surat Thani — 79 km southwest
• Nakhon Si Thammarat — 123 km south
• Chumphon — 135 km northwest
• Kawthoung — 160 km west, Myanmar
• Takua Pa — 190 km southwest
• Phatthalung — 214 km south
• Trang — 223 km south
• Ban Ratsada — 247 km southwest
• Phuket — 249 km southwest
• Ban Talat Yai — 249 km southwest

Largest cities in Surat Thani

• Surat Thani — 132,040

Largest cities in Thailand

• Bangkok — 5,104,476
• Samut Prakan — 388,920
• Mueang Nonthaburi — 254,375
• Chon Buri — 219,164
• Phra Pradaeng — 196,129
• Bang Khae — 193,002
• Hat Yai — 191,696
• Pak Kret — 190,272
• Sai Mai — 188,123
• Si Racha — 178,916

Map of Thailand and all its cities →

Sources: place names, coordinates, populations and time zones from GeoNames (CC BY 4.0, data retrieved October 2026). Population figures are the latest values recorded in GeoNames; depending on the country they refer to the city proper, a municipality or a wider urban area, so they can differ from census or metro-area figures. Map © OpenStreetMap contributors.