Aqua World is the water-themed and third world of DK: King of Swing. It is accessible after Wild West World is completed, and is followed by Ice World. Aqua World's boss is Davy Bones, who can be fought after Donkey Kong or Diddy Kong complete every level.
The Aqua World has a variety of landmarks, a fraction of which are water-themed. The first level and the boss fight take place underwater, while the second level is set by a waterfall with Lockjaws that jump out at anyone. The northeastern part of Aqua World has a derelict, haunted galleon. The Kremlings also have a base on a small island.
A few objects first appear in this world, such as falling Pegs, Spinning Pegs, cannons that fire out pegs, and pegs that only appear when the Kong holds onto another one around them. Aqua World features both land and underwater enemies. The land enemies include Kritters, Flipflaps, Powans, and Zingers, while the ones featured underwater are Shuris and Lockjaws.
Aqua World has four regular levels, and each one has their own Medal. The first two levels have a bronze one, the next two have a silver one, and the boss battle has a gold Medal, just like the other worlds. A Crystal Coconut is hidden in every level except for the boss fight.