Phimai is a district in the northeastern part of Nakhon Ratchasima province, northeastern Thailand. Phimai is a lowland, making it a suit…Phimai is a district in the northeastern part of Nakhon Ratchasima province, northeastern Thailand. Phimai is a lowland, making it a suitable location for settlement and agriculture. The area is fed by the Chakkarat, Khem, and Mun rivers. There is also a source of salt, which is an important resource.