Goku traveled to the planet Yardarrat, populated with the race Yardarratan. They are not very strong, but have many strange yet powerful techniques. This planet has 40x Earth's gravity.
Sinero: City where all the inhabitants of the planet live. Also home to Suno the master of the planet.
Yardarrat has one Master on it's planet; Suno who is in the city of Sinero. There are 2 regions on the planet.
Plains: A region of flat ground that can also be used for training and sparring as well as places to battle.