Phitsanulok is rich resources most Phitsanulok terrain is flatlands, with one third of the area being mountain ranges on the north and the east. Its unique natural endowments including natural parks and waterfalls make a trip to Phitsanulok worthwhile. Apart from its exceptional natural charisma, Phitsanulok provides visitors with an opportunity to explore notable chapters of Thailand's history. Phitsanulok Long-tailed Boat Races the first weekend of each October, Long-tailed Boat Races are held in front of Wat Phra Sri Rattana Mahatat Woramahawihan in the Nan River .