Phitsanulok, is a province of central Thailand. It borders the provinces of Uttaradit to the north, Loei and Phetchabun to the east, Phichit to the south, Kamphaeng Phet to the southwest, and Sukhothai to the west. Its border was shared with Laos to the northeast. Covering an area of 10,815 square kilometres, Phitsanulok is the fifteenth-largest province in Thailand. As of 2023, it has a population of about 840,000, making it the eighth-most populous province in the region.