Kohala

Kohala is the oldest of five volcanoes that make up the island of Hawaii. Kohala is an estimated one million years old—so old that it experienced, and recorded, the reversal of earth's magnetic field 780,000 years ago. It is believed to have breached sea level more than 500,000 years ago and to have last erupted 120,000 years ago. Kohala is 606 km2 in area and 14,000 km3 in volume, and thus constitutes just under 6% of the island of Hawaii.Kohala is a shield volcano cut by multiple deep gorges, which are the product of thousands of years of erosion.