Hilo Bay is a large bay located on the eastern coast of the island of Hawaiʻi. The modern town of Hilo, Hawaii overlooks Hilo Bay, located at 19°44′10″N 155°4′37″W / 19.73611°N 155.07694°W. North of the bay runs the Hamakua Coast on the slopes of Mauna Kea, and south of the bay is the Puna district on the slopes of Mauna Loa. The area just inland fro…Hilo Bay is a large bay located on the eastern coast of the island of Hawaiʻi. The modern town of Hilo, Hawaii overlooks Hilo Bay, located at 19°44′10″N 155°4′37″W / 19.73611°N 155.07694°W. North of the bay runs the Hamakua Coast on the slopes of Mauna Kea, and south of the bay is the Puna district on the slopes of Mauna Loa. The area just inland from the bay is the Hilo district, divided into north and south Hilo within the County of Hawaii. Banyan Drive runs through Liliʻuokalani Gardens near downtown Hilo at the edge of the bay.