Vĩnh Phúc is a mountainous province northwest of Hanoi in Vietnam. It's known for traditional Xoan singing during the Lunar New Year. In the northeast, the wooded mountains of Tam Đảo National Park are home to Thác Bạc waterfall and the Buddhist monastery Trúc Lâm Tây Thiên. The resort-fringed Đại Lải Lake lies to the east. West of here is the soaring brick Binh Son Tower, originally built during the Tran Dynasty.