World Martial Arts Tournament

The World Martial Arts Tournament is where Goku rapped during Goku vs Superman.

Information on the Location
The World Martial Arts Tournament, also known as the Tenka'ichi Budōkai, is a martial arts event in the Dragon Ball manga, and in the anime series Dragon Ball, Dragon Ball Z and Dragon Ball GT. Held on an arena, it features the Earth's strongest fighters, as well as the regular participation of the Dragon Ball Gang and the Z Fighters on a brawl for the title World Martial Arts Champion and a huge amount of Zeni (a type of currency in the Dragonball universe).

Appearance in the Rap Battle
During Goku vs Superman, Goku rapped his first verse in the ring of the World Martial Arts Tournament. Krillin also made a cameo here during Goku's first verse.

Trivia

 * The words in the location is actually the Japanese translate of the series "Epic Rap Battles of History".