A coconut is actually a drupe, not a nut. It is the fruit of the Cocos Nucifera, also known as the coconut palm. It is unclear where exactly the tree comes from. The coconut is a buoyant fruit, they have even floated all the way up to the coast of Norway! The fruit of this palm consists of several layers. The brown coconut as we know it grows on the tree inside a thick green shell. The coconut has a hard outer layer to which a layer with the inner flesh is attached. Eventually the cavity in the middle of the coconut is filled with coconut water.