The exclusive economic zone of North Korea stretches 200 nautical miles from its basepoints in both the West Sea (Yellow Sea) and the Sea of Japan. The EEZ was declared in 1977 after North Korea had contested the validity of the Northern Limit Lines (NLL) set up after the Korean War as maritime borders. The EEZ has not been codified in law and North Korea has never specified its coordinates, making it difficult to determine its specific scope.