Starting in the north at the mouth of the Hualien River, the designated area runs southward as far as Little Yehliu; on the west it is bounded by the coastal mountain range running north-south parallel to the Central Mountain Range; and in the east it runs into the Pacific Ocean.
北起花蓮溪口，南到小野柳，西側是與中央山脈平行的海岸山脈，東臨太平洋，其間還有二十多條溪河自海岸岸山脈西向東平行入海。