Question: what is benham rise caldera?
Answer: The circular depression on the Benham Rise is surrounded by a crest with scarps as high as 100 to 300 meters (300 to 900 ft). It may be the world's largest known caldera with a diameter of ~150 km (93 miles). ... The researchers named the caldera Apolaki, meaning “giant lord”, after the Filipino god of the sun and war.