Mt. Lavalava

The volcano on Lavalava Island in Paper Mario, where Mario obtained the Ultra Hammer. It is also the home of Lava Piranha, who guards the fifth Star Spirit, Misstar. It's the fourth part of the chapter ( getting to the island, the beach and Yoshi's Village, and Jade Jungle ), and Kolorado will accompany you through most of it, because he's searching for a treasure hidden in the volcano.