Elysium Mons: Elysium is a major volcanic province. This is the central Volcano in Elysium. It has an approximately circular caldera at the summit, with evidence of two caldera collapse events. It has deep channels incised into the caldera rim and upper flanks: the channels developed as a result of faulting followed by lava which poured through them.However, no channels due to water runoff are present on Elysium Mons ( it never rained there).