Book excerpt: In The Estonian Straits, Alexander Lott establishes the interrelations between the main legal categories of straits. Through this detailed and exceptional account, he provides legal classifications for the Viro Strait in the Gulf of Finland as well as the Irbe Strait and the Sea of Straits in the Gulf of Riga. Consequently, the passage rights of foreign ships and aircrafts in the northeastern part of the Baltic Sea are determined. The author demonstrates that the legal regime of the Estonian Straits has been and continues to be determined by such factors as the outer limits of maritime zones, treaties, islands, maritime boundary delimitation, domestic law on internal waters and baselines as well as geopolitical implications (particularly the concept of State continuity).