Flight Hilo-Honolulu, view to Mauna Kea (4207 m) in the right forground and to Mauna Loa (4169 m) in the central background. The dormant shield volcano of Mauna Kea is the highest summit of Hawai'i and the highest mountain in the world when taking its submarine basis as reference. Mauna Loa - another shield volcano - is one of the largest active volcanoes worldwide.