Northern Limit Line

Incidents have occurred in waters south of the Northern Limit Line, shown in red separating North and South Korea.

The Northern Limit Line (NLL; Korean: 북방한계선) or North Limit Line is a disputed maritime demarcation line in the Yellow (West) Sea between the Democratic People's Republic of Korea (DPRK) in the north, and the Republic of Korea (ROK) in the south. This line of military control acts as the de facto maritime boundary between North and South Korea.