Yongdae Gap (Korean: 용대갑; Hanja: 龍台岬; "Dragon-Terrace Cape") is a North Korean headland in the middle of the country's eastern coast along the Sea of Japan. It forms the southeastern corner of South Hamgyong's Tanchon and the western point of a narrow bay sheltering Songjin and Hwadae.

In the 19th century, Yongdae Gap was known as Cape Schlippenbach or Schlippenback. During the Japanese occupation of Korea, it was known as Ryūdai-kō.

Yongdae Gap is the southern point of a small peninsula whose most conspicuous summit is Wonsandok San, which rises to an elevation of 504 meters (1,654 ft) about 4 miles (6.4 km) due north of the cape. The highest visible mountain from the point is Yongyon San(용연-산, 龍淵山), which rises to an elevation of 1,598 meters (5,243 ft) about 17 miles (27 km) farther NNW. Its range extends 25 miles (40 km) north from the cape.

A half-mile (.8 km) to the west of the peninsula is Yongdae Myoji ("Yongdae Anchorage"). This has a depth of 9.1–13 meters (30–43 ft) and bottom in fine sand, but is unsafe except as a shelter from NE winds.

To the east of Yongdae Gap is a narrow but long and deep bay extending about 40 miles (64 km) east to Musu Point.

Yongdae Gap has a lighthouse, but it is closed to the public and the American National Geospatial-Intelligence Agency notes that "the existence and operation of all navigational aids should be considered unreliable on the east coast of North Korea".

• Yongdae, its namesake village
• List of lighthouses in North Korea

• Jarrad, Frederick W. (1884), The China Sea Directory, Vol. IV: Coasts of Korea, Russian Tartary, the Japan Islands, Gulfs of Tartary and Amùr, and the Sea of Okhotsk, London: J.D. Potter for the Hydrographic Office of the Admiralty.

• "NK 52-11: Sōngjin", AMS Series L552, Washington: Army Map Service, 1954, a topographical map of the area around Yongdae Gap.

40°28′35″N 129°04′02″E / 40.4763745°N 129.0671542°E / 40.4763745; 129.0671542