@Zzylith 27 February 2021 more from that month

Diamond Head Diamond Head is a volcanic cone on the Hawaiian island of Oahu and is the most popular Hawaii State Park. Hawaiians call it Lēʻahi (brow of the tuna) in reference to the formation’s ridgeline, which resembles the tuna fish’s dorsal fin. Diamond Head is part of the Ko’olau Range of volcanoes that began erupting below sea level over 2.6 million years ago. A single eruption around 300,000 years ago created the crater. Diamond Head stands at an elevation of 762 feet above sea level. When measured from the crater floor, the Diamond Head Mountain towers to 560 feet. Diamond Head is monogenetic, which means eruption occurs only once. The last eruption of the volcanic tuff cone was likely 150,000 to 200,000 years ago. It has remained dormant since.