Hoa Tien Lake is a blue mountain lake located in Ngoi Hoa village, Tan Lac district, Hoa Binh province. Indigenous people call this Hoa Tien lake, some travel agencies call it Dragon Eye lake. Although it is connected underground with Hoa Binh Lake and the lake's water level rises and falls along with Hoa Binh Lake, no matter how opaque Hoa Binh Lake is through the seasons, Hoa Tien Lake still maintains a jade green color all year round.