Phú Thọ is a province in north Vietnam at the confluence of the Red River and Da River. It is home to Hùng Temple, an ancient temple complex on Nghĩa Lĩnh mountain. Xuân Sơn National Park in the west features limestone caves and waterfalls. Plant-rich Ao Chau lagoon and Mother Au Co Temple, which honors the country’s legendary mother, are in Hạ Hòa district. Traditional Xoan singing is often performed at festivals.