Largest cities
Bangkok 5,528,000 pop., 18,007,000 urban aggl.
Chao Phraya Surasak 146,000 pop.
Chiang Mai 123,000 pop., 693,000 urban aggl.
Nakhon Ratchasima 123,000 pop., 657,000 urban aggl.
Pattaya 118,000 pop., 1,373,000 urban aggl.
Nakhon Si Thammarat 100,000 pop.
Phuket 77,800 pop., 515,000 urban aggl.
Rayong 62,400 pop., 612,000 urban aggl.
Highest mountains
Doi Inthanon 2,565 m (8,415 ft)
Longest rivers
Mekong 4,350 km (2,703 mi) total, 900 km (537 mi) in Thailand
Salween 2,815 km (1,749 mi) total, only for a small portion, near the mouth, flows on the border between Thailand and Myanmar
Chao Phraya (with Nan) 1,112 km (691 mi)
Largest lakes
Songkhla Lake 1,040 kmē (402 sq mi)
Bueng Boraphet 212 kmē (82 sq mi)
Nong Han 125 kmē (48 sq mi)
Largest islands
Phuket 543 kmē (210 sq mi)
Ko Samui 229 kmē (88 sq mi)
Ko Chang 217 kmē (84 sq mi)