Narathiwat is one of the southern provinces (changwat) of Thailand. Neighboring provinces are Yala and Pattani. To the south it borders the Malaysian state of Kelantan and Perak. The southern railway line ends in this province, which is one of the nation's four provinces that border Malaysia. The province features a range of cultures as well as natural resources, and is relatively fertile. Narathiwat is about 1,140 kilometers south of Bangkok and has an area of 4,475 km2 (1,728 sq mi). Seventy-five percent of the area is jungle and mountains and has a tropical climate.

The provinces of Thailand are administrative divisions of the government of Thailand. The country is divided into 76 provinces proper, with one additional special administrative area. They are the primary local government units and act as juristic persons. They are divided into amphoe (districts) which are further divided into tambon, the next lower level of local government.