How nations carve up the ocean into invisible, legally defined territories
In short: The open ocean is not as lawless as it appears. Beneath the waves, countries establish precise, invisible borders that dictate who owns the seabed, who can fish, and who controls mineral rights. These maritime boundaries are calculated from coastal baselines, creating a complex, layered map of global sovereignty.
Maritime boundaries are conceptual divisions of the sea that define a nation's authority over biological and mineral resources. Unlike land borders, these lines are often measured as concentric zones extending from a country's coastline. The process begins by establishing a baseline, which can be the low-water mark or a straight line enclosing bays and estuaries. From this starting point, international legal frameworks define specific zones, such as the territorial sea reaching 12 nautical miles, a contiguous zone at 24 nautical miles, and an exclusive economic zone extending up to 200 nautical miles.
These divisions are not merely theoretical; they have significant strategic and economic consequences. When the distance between two nations is less than 400 nautical miles, their zones inevitably overlap. In such cases, international practice often relies on the equidistance principle or specific multilateral treaties to resolve the conflict. For example, the 1982 agreement between Australia and France utilized 22 coordinate points to create a modified equidistant line in the Coral Sea, effectively managing the maritime space between their respective territories.
However, not all maritime borders are settled. Disputes often arise from historical claims or differing interpretations of international law. The situation in the Yellow Sea between the two Koreas serves as a stark illustration of these tensions. While the United Nations Command established a line of military control in 1953, North Korea asserts a different configuration, leading to a history of friction in the region. These unresolved controversies highlight the difficulty of applying rigid geometric lines to a dynamic, fluid environment where geography and politics frequently collide.
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Sources
- Summary by Intellect · source: Maritime boundary
- Also: Wikidata — maritime boundary · CC0
- Also: www.gov.uk — UK, UK Overseas Territories and UK Crown Dependencies Maritime Limits and Law of the Sea
- Also: Wikidata — Maritime Boundary (County of Louth) Order, 1998 · CC0
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