A range of different types of maritime zones.
- Initially the claims to the territorial sea were so limited( little consideration).
- Territorial sea claims expanded further into the oceans and new maritime zones were added, there was an increasing need to settle upon methods for maritime boundary delimitation.
- Firstly, in the case of adjacent states : to address how the adjoining territorial sea claims of these states would be delimited. Then continental shelf, fishing zone, EEZ
- Secondly, opposite states : Initially, not pose much difficulty, however when continental shelf claims gained popularity following the Truman Proclamation.
Gradually over time, initial maritime claims has been replaced by focus upon overlapping maritime claims which require boundary delimitation.
The principle of the mid-channel or thalweg had some currency in the case where two states shared a river and there was a need to determine the international boundary through the river.
-As Fulton observed, by applying these principles to the seas the effect was that ‘the mid-line in the sea lying between the coasts of two states was held to be the boundary of their respective maritime jurisdiction or sovereignty.