Wat Aphai (also written Wat Aphay or Wat Apai) is a small monastery near the banks of the Nam Khan river. It was built by a merchant of pickled fish, pla-dak, during the reign of King Photthisarat (1520-48). For that reason, its original name was Wat Hai Pai Pla Dak. The name was changed to Wat Aphai during restoration in 1923. On the gable facing west is the carving of Erawan, the triple-headed elephant, the vehicle of the deity Indra. Around the sim is a cloister with murals depicting stories from the Buddha Maitreya.