領海

1. Origins, structure, and basic meaning

• Structure: 領海 (りょうかい) is an international-law compound noun for coastal waters over which a state exercises sovereignty.
• Basic usage: 国ごとの領海が色分けされる makes each state’s waters the areas mapped by color, while 領海の境界から距離を取る identifies the boundary a ship keeps away from.

2. Common pitfalls and similar expressions

• Maritime zone and its boundary
  • 領海が色分けされる concerns an area, whereas 領海の境界 is its outer line. Territorial waters are not all seas belonging to a country or the high seas.