LongBeach can be entered through DeepDive by walking along the path made available after defeating DeepDragon. It can also be dropped onto from above RainbowDive by falling off The Curtain or anywhere on the SkyLands.
LongBeach is mostly horizontal, with small drops. The ground is mostly made of sand in a gradual slope to the waters.
At the end of the beach, there is a small wooden house with a pink bird living in it. You can talk to the bird, and she talks about escaping the ghosts with a boat. At the end of the game, when you beat the FinalBoss, you can sail away with her.
On the fourth screen from the left, if you divebomb near the right, you can make a hole and enter UnderTomb.