What places have shipping lanes as borders?

Shipping lanes often serve as informal borders in various regions, particularly in international waters. Notable examples include the Strait of Hormuz, which separates Iran from several Gulf states, and the Strait of Malacca between Malaysia and Indonesia. The English Channel also acts as a boundary between the UK and France, where shipping lanes are heavily trafficked. Additionally, the shipping lanes in the Caribbean Sea can delineate maritime boundaries between several island nations.