Sunlight Tree Eve

The Sunlight Tree Eve (陽樹イブ) is a colossal tree that absorbs sunlight and transfers it to it roots. It is through this tree's roots that Fishman Island is able to have light 10,000 meters below the surface of the ocean.

Usopp notes there may be some connection between it and the Treasure Tree Adam.

Trivia

 * The names "Adam" and "Eve" were supposed to be the names of the first two humans, according to biblical text.