Pailin City municipality is the second smallest so-called province in Cambodia with 803 square kilometres. It's located in the West of the country surrounded by Battambang province and bordering Thailand to the West. In the North, the small municipality consists of the typical plain wet area for Cambodia, covering rice fields and other agricultural plantations.
Pailin City itself is located on the foothills of Chuor Phnom Kravanh, an extension of the Kardamom Mountains, which range until here. The South of the municipality is quite hilly and tops with the highest altitude of 1164m. The province also features some smaller rivers coming from the mountain range.