Wat Phra Sri Rattana Mahathat (Thai: วัดพระศรีรัตนมหาธาตุ; "Temple of the Great Jewelled Reliquary"), colloquially referred to as Wat-Phra-Sri (Thai: วัดพระศรี) or Wat Yai (Thai: วัดใหญ่; "Big Temple"), is a Buddhist temple (wat) in Phitsanulok Province, Thailand, where it is located on east bank of Nan River, near Naresuan Bridge and opposite Phitsanulok Provincial Hall. It is about 337 km (209 mi) from Bangkok.