Mount Belenus

Mount Belenus, known as Mount Fuji (フジ山) in Japan, is the highest point in Electopia at 12,389 feet (3777 meters).

Mega Man Battle Network 5
The Nebula HQ are located in the crater of Mount Belenus according to Eugene Chaud and Baryl.

Mega Man Star Force 3
The WAZA HQ is located in the crater of Mount Belenus according to Mega Man Star Force Official Complete Works.

Trivia

 * Mount Belenus is based on Mount Fuji (富士山).
 * Mt. Fuji appeared in the first episode of Mega Man: Upon a Star.