Kalimutu lake or Three Colors Lake.
The name was given by Portuguese who reached this island in the 15th Century. 'Flores' means flowers, not by the Flowers grow on the land, but beneath the sea, coral, fishes and other marine lifes.
The most beautiful coral reefs occur on the northern coast and western of the Island. Most of accommodations are simple standard, some have clean room with inside bathrooms and sufficient for the adventurous travelers.
The most magnificent site is the three colored lakes of Kelimutu volcano. Each lake has a different color: blue, green and black.
Other attractions include spectacular hand-woven textiles of Maumere, Ende-Lio, Ngada, the traditional megalithic village of Bena and other traditional villages in Ngada Regency (Central Flores).
Source: bali-go-round.com