Prominent volcanic cones in the region include Mount Maunganui, Mount Tarawera and Mount Edgecumbe/Putauaki. These features also have cultural significance to local Māori. The Kaimai and Mamaku mountain ranges lie at the western border of the region. Swamp land was formerly concentrated around a number of rivers, but much of this was dredged in the early part of the 20th century to increase land for settlement and other uses. Large native and foreign (planted) forest areas are found in the inland parts of the region. The Kaingaroa Forest is the world's largest planted forest, comprising radiata pine mainly used for timber.