Ulupa'U Crater is a cinder cone in the state of Hawaii, where it is located near Marine Corps Base Hawaii.
Ulupa'U Crater was formed during the Honolulu Volcanic Series, a series of eruptions coming from the Ko'olau Range that formed other volcanoes such as Diamond Head, Punchbowl Crater and more. Some people don't consider these craters being formed during the Honolulu Volcanic Series to be legitimate volcanoes but rather vents of the Ko'olau Range.