Hawaii, United States
Kohala is the oldest of five volcanoes that make up the island of Hawai'i. and to have last erupted 120,000 years ago. Toward the end of its shield-building stage 250,000 to 300,000 years ago, a landslide destroyed the northeast flank of the volcano, reducing its height by over 1000 meters and traveling 130 kilometers across the sea floor. Kohala is 606 square kilometers (235 square miles) in area and 14,000 cubic kilometers (3,400 cubic miles) in volume, and thus constitutes 5.8% of the island of Hawai'i. It last erupted 120,000 years ago.
The volcano is pocketed by multiple deep gorges, the product of thousands of years of erosion. In violation of the typical symmetry of Hawaiian volcanoes, Kohala is shaped like a foot. Kohala is an estimated 1 million years old—so old that it experienced, and recorded, a reversal of magnetic polarity 780,000 years ago.