The island where Cell absorbed Android 18
The Tropical Islands are an area on Earth located east of Papaya Island. It is where Piccolo fought Android 17, and where Cell absorbed Android 17 and Android 18.
Overview
Android 17 vs. Piccolo on one of the islands
The Tropical Islands were named in the video game Dragon Ball Z: The Legacy of Goku II. Enemies encountered here are a Mercenary Clan, Sabertooth Tigers, alligators, ladybugs, and pterodactyls. This area is also where the Seven-Star Dragon Ball was located right before the Cell Games in The Legacy of Goku II (Cyborg Tao brought it to Vodka's fortress in the anime).
Archipelago in Budokai 3
The Islands area is a playable battle stage in the Butōden series, Dragon Ball Z: Supersonic Warriors 2 (called Uninhabited Island), the Budokai series, the Budokai Tenkaichi series, the Raging Blast series, Dragon Ball Z: Ultimate Tenkaichi, and Dragon Ball Z For Kinect. In Dragon Ball Z: Budokai 3 and Dragon Ball Z: Infinite World, this area is called Archipelago.