A coastal state is a term found in the law of the sea. Although widely used in the legal documents, including the UN Convention on the Law of the Sea (UNCLOS), this term lacks a precise definition. The "essential idea" of a coastal state is having an open sea coast and asserting the sovereignty or jurisdiction in the areas of the sea adjacent to this coast. Norway, Canada, and Chile are examples of the coastal states, Churchill counts up a total of 150 of such states (while considering the definition in the Virginia Commentary, "the State from the coastline or baselines of which the breadth of the territorial sea is measured" to be "overly narrow").
The interests of a coastal state can be in conflict with those of the maritime nations (the ones that greatly depend on the sea trade routes). For example, when the marine pollution is concerned, the coastal states seek to protect their shores and waters, while the maritime nations worry about limits the protective regulations place onto the freedom of navigation. Many states have both maritime and coastal interests, so the groups of coastal and maritime states intersect to a large degree.
