Located on the northern bank of Khlong Samrong in Tambon Bang Phli Yai, not too far from Wat Bang Phli Yai Nai. It was constructed around 1824 and originally called Wat Klang before changing to Wat Rat Sattha Tham and eventually Wat Bang Phli Yai Klang. The temple contains an immense reclining Buddha image of approximately 53 metres long known as Somdet Phra Sakayamuni Si Sumet Bophit. There are 4 storeys inside the image itself. The 1st floor houses meditation cells; the 2nd floor has images of the 500 Arahats and murals depicting Hell and Heaven; the 3rd floor has paintings of several other sacred Buddha images; the 4th floor houses the Lord Buddha’s relic taken from Colombo, Sri Lanka, in 1987, and also the Reclining Buddha’s heart.