Laem Sai Estuary Fortress was constructed in the reign of King Rama III, at the time of the citys establishment. Today this fortress is behind the Songkhla Provincial Police Headquarters.

• Located at the back of the municipality of Songkhla
• By Bus - From Bangkok: There are daily buses from Bangkok to Songkhla and Hat Yai. The journey takes about 13 hours.
• The State Railway of Thailand provides daily rapid and express train services from Bangkok to Hat Yai. The trains depart from Bangkok's Hualamphong Railway Station at 12.25 p.m., 2.20 p.m., 2.45 p.m., 3.50 p.m. and 10.50 p.m. Travel time is about 17 hours.