Wat Chang Hai is located in Ban Pa Rai, tambon Thung Phla, Khok Pho district, 31km from Muang Pattani and near the Hat Yai-Sungai Kolok railway.It is over three centuries old. Its prayer hall enshrines a lifesize statue of Luang Pu Thuad. Legend has it that Luang Pu Thuad set his foot on Nui Island in the present-day Khanom district, Nakhon Si Thammarat.He turned seawater into spring water during his junk-ship journey from Songkhla to Ayutthayaduring the Ayutthaya period.The ship had to stop in front of the island during a rainstorm and finally ran out of fresh waterfor drinking. Hence, the monk incredibly turned seawater into freshwater for all crewmen andpassengers to drink. Local people had a big statue of Luang Pu Thuad built on the island for anyone to worship.