 Neighboring districts are (from the north clockwise) Sikhio, Wang Nam Khiao of Nakhon Ratchasima, Mueang Nakhon Nayok of Nakhon Nayok Province, Prachantakham of Prachinburi Province, and Muak Lek of Saraburi Province.The district is the gateway to the northeast (Isan) of Thailand from the central region, as the main pass through the Sankamphaeng Range mountainous area is in the southern section of the district.The southern parts of the district are part of Thailand's first and largest national park, Khao Yai.