Chuja Kundo (Chuja Gundo)(33°57'N., 126°20'E.) is a group of islands, islets, and rocks lying about 25 to 30 miles N of Cheju Do (Jeju Do). Vessels should avoid passing through this group. Jeolmyeong Seo (33°52'N., 126°19'E.), considered to be the southernmost of the group, is a conical shaped rock lying 9 miles NNW of Hwa Do. Heavy tide rips are reported within 1 mile of Jeolmyeong Seo. Sudeog Do, 2.75 miles NE of Jeolmyeong Seo, is prominent as its N side is a precipitous cliff 126m high.

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