Hakalau is a small unincorporated community located along the Hamakua coast about 15 miles (24 km) north of Hilo on the Big Island of Hawaii in the U.S. state of Hawaii at 19°53′49″N 155°7′35″W / 19.89694°N 155.12639°WCoordinates: 19°53′49″N 155°7′35″W / 19.89694°N 155.12639°W.
The Hakalau Stream flows from the slopes of Mauna Kea, in the area of 19°48′55″N 155°21′55″W / 19.81528°N 155.36528°W and flows into the Pacific Ocean.