Wang Matchcha (Fish Sanctuary) is a popular relaxation spot along the Tha Chin River in front of Wat Nang Sao, serving as a protected aquatic zone where dense schools of iridescent sharks and various fish species coexist with remarkable tameness. The surrounding area is shaded and refreshed by cool river breezes all day, featuring floating platforms selling fish food and seating areas where devotees can make merit by feeding the fish after worshipping Luang Phor Dam and the Maha Ud hall. The sight of large fish swimming in the waterway against the backdrop of the junk-shaped ordination hall creates a profound sense of relaxation and spiritual joy for families and tourists visiting Samut Sakhon province.