Chainat is located on the east bank of the Chao Phraya River. The community was moved from the old site at Sankhaburi in the reign of King Rama IV. Chainat was an important town used several times as a base to confront the Burmese army. Every time, the Burmese were defeated, thus originating the name of Chainat which means a place of victory.

Chainat occupies an area of 2,469 square kilometres and is administratively divided into 6 districts: Amphoe Muang Chai Nat, Amphoe Hankha, Amphoe Manorom, Amphoe Sankhaburi, Amphoe Sapphaya, Amphoe Wat Sing, and 2 sub-districts: King Amphoe Nong Mamong and King Amphoe Noen Kham.

Distances from Amphoe Muang to Other Districts :

Hankha 35 kilometres
Manorom 14 kilometres
Sankhaburi 27 kilometres
Sapphaya 21 kilometres
Wat Sing 22 kilometres
Nong Mamong 42 kilometres
Noen Kham 48 kilometres