Flight Kahului-Hilo, view to Mauna Kea (left, 4207 m), Mauna Loa (right, 4169 m), and to the Hāmākua Coast in the foreground. 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.