A type of proto‐historic and early historic site found in Thailand and Cambodia. Many seem to have been well‐established settlements or industrial areas before one or more concentric rings of moats were added during a period of expansion around ad 300–500. Many seem to have dominated clusters of smaller, non‐moated sites in the vicinity. By about ad 650 many of the larger settlements of the Mon states in central Thailand were moated. Rectangular moats are characteristics of the Khmer sites of the 11th to 13th centuries ad in Thailand.