|Game board is in||Mario Party 5|
|Star Space type||Normal|
|Happening Space Effect||Varied|
|Availability||Available at the start|
Undersea Dream is one of the 7 playable board maps in Mario Party 5. This map was created from dreams about sea life. It closely resembles a coral reef and the 2 parts of the board are connected by a bridge. There are quite a few Happening Spaces scattered about the board with different effects. Happening Spaces next to sunken ships will cause a dolphin to come out and forcefully carry the player to some other space on the board at random. Landing on the Happening Space next to the whale will cause the whale to blast the player to a space that's closer to the Star Space. The Happening Space next to the Cheep Cheep on the right side of the board will allow the player to have a chance to get a capsule. There is also a slight chance that an old boot will be under the chosen pearl. You keep whatever capsule appears. Finally, there are two Happening Spaces next to logs. Each will allow the player to ride a manta to the Happening Space on the other side while collecting coins along the way.
 Story Mode
In Story Mode, Bowser and Koopa Kid came here to replace Undersea Dream with their own evil dreams. The player(playing as a playable character from Mario Party 4) came to stop them. Bowser had Koopa Kid split in 3(Red, Blue, and Green) to try and overwhelm the player. Upon defeating the 3 Koopa Kids, Bowser and the original Koopa Kid would flee to try and ruin another dream. The battle took place on a much smaller version of Undersea Dream, using just the left side of the board.