from http://en.wikipedia.org/wiki/Sun_Moon_Lake

Sun Moon Lake (Chinese: 日月潭; pinyin: Rìyuètán; Wade–Giles: Jih4-yüeh4-t'an2; Pe̍h-ōe-jī: Ji̍t-goa̍t-thâm; Zintun in the Thao language, also Lake Candidus) is the largest body of water in Taiwan as well as a tourist attraction. Situated in Yuchi, Nantou, the area around the Sun Moon Lake is home to the Thao tribe, one of aboriginal tribes in Taiwan.[1] Sun Moon Lake surrounds a tiny island called Lalu.[2] The east side of the lake resembles a sun while the west side resembles a moon, hence the name.[3]