Grandpa Sea is located on the side of Taibai Mountain on the Taipei side of the mountain top, at an altitude of 3590 meters. It is a typical ice bucket lake with a complete preservation of Taibai Mountain, forming in the ancient Quaternary glacier. The lake is as clear as a mirror and blue waves. The lake is suddenly filled with mist, and the clouds are scattered. The folk call this fog "God's tent". There is a white-topped stream by the lake, big like swallows, black-breasted red and brown, white markings on the top of the head, singing "squeaky",