Ders-A Island

The Ders-A Island is the main location of almost all the Ders-Eries games. It is owned by Ghashto Dersa and has a vast history as a trading route and industrial power.

Ders-B Island
The Ders-B Island has drifted through the oceans ever since the last Ice Age finished. It split from the Rexo Republic and drifted around the Antarctic Oceans for thousands of years. In Ders-B, it collides with the Ders-A Island, raising some new mountains and merging the 2 islands.

Dhashto's Island
In Ders-A, Dhashto Gersa forged a base in the shape of a island; it is where the fiinal boss takes place. During Phase 3, The Core starts to go mental and the Island's contents travel through different realms. It is later mirrored by General Ocutan's Island in Ders-C Part 1 and again in Part 2.