The Gyeongju coastline runs for between Pohang in the north and Ulsan in the south. There are no islands or large bays, only the small indentations made by the small streams flowing off the Dongdae ridgeline. Because of this, the city has no significant ports, though there are 12 small harbors. One such harbor in Gyeongju's southeast corner is home to the Ulsan base of the National Maritime Police. This base is responsible for security over a wide area of South Korea's east-central coast.