The ruins of the ancient port city of Satingpra are just few kilometres north of Songkhla. It was one of the most important trading centres of the Tambralinga Kingdom. Archaeological digs and investigations conducted toward the end of the 20th century testify the existence of a fortified citadel protected by a moat and a quadrangular surrounding wall made of brick. A sophisticated system of canals connected the sea to the Songkhla Lake permitting the circulations of ships. The excavations brought to light artifacts of great historical and artistic value.

Source: Onsite visit and Wikipedia