Kanchanaburi is Thailand's third largest province, covering an area of 19,486 square kilometers. The provincial area is mountainous and borders Myanmar to the west.

Kanchanaburi is the site of the world-famous Bridge Over The River Kwae, immortalized in books and movies, and is noted for rugged natural beauty where mountains and river valleys have inspired development of hydro-electric power and where labyrinthine reservoirs provide further scenic elements to the province's natural beauty.