Namo Gate, Sukhothai Province
Built in the middle of the southern wall of Sukhothai, the southern gate is known as Pratu Namo, and has a defensive tower projecting from the wall. Stone Inscription No.1 reads Sukhothai has four gates ... and ... enclosed with a wall of 3400 was (6800 m) long.
To defend Sukhothai against enemy attack, two outer earthen ramparts and an inner earthen structure covered with laterite and brick were built, with three moats in between. The moats also functioned as channels to carry away water for flood prevention.

Namo Gate, Sukhothai Province Click to see in large