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.