1. No other nation recognizes China 's U-shaped maritime border .

2. At the same time, snipers were observed at high ground adjacent to the Maritime Border Guard base,

3. The Korean Armistice Agreement specified a Military Demarcation Line as a land border between North and South Korea, but failed to determine a maritime border.

4. A maritime Border is a division enclosing an area in the ocean where a nation has exclusive rights over the mineral and biological resources, encompassing maritime features, limits and zones