Strait of Dover

The Strait of Dover or Dover Strait (ドーバー海峡) is a strait located at the narrowest part of the English Channel which separates Britain from continental Europe. The Channel Tunnel operated by Eurotunnel is located directly under the strait. The Strait of Dover is the site of several events in the Toaru Majutsu no Index universe.

Princess Villian hostage crisis
10 years prior to the start of the current year of the timeline, Princess Villian in her Traveling Fortress was abducted by the Spanish Astrological Sect near the French side of the Strait of Dover. Due to political complications involving the British Royal Family itself, the Knights of England could only camp at the English side of the strait and watch the French battle the sect. William Orwell, as a mercenary and is not subject to the politics between Britain's major factions, later goes out on his own to save the princess, ending the crisis.

Necessarius Special Admission Test SS
After stealing the Necronomicon from the British Library, Arlands Darkstreet of the magic cabal Dusk Waiting to Awaken performed a ceremony on an ocean salvaging terminal in the strait to summon the sunken city R'lyeh. This is later put to a stop by Amakusa Church Christians in their attempt to clear their name after being framed by the magic cabal.

British Royal Family Arc
During the coup d'état, Princess Carissa dispatched a destroyer in the strait to threaten France. The French also had a nuclear submarine hidden in the strait with a nuclear missile aimed at London, which Carissa proceeded to sink while speaking to the French president.

World War III Arc
The Strait of Dover was the site of a battle between English forces and invading French forces. The waters of the strait were frozen by the invaders, impeding their enemy's naval capabilities. The arrival of Carissa and the Mobile Fortress Glastonbury helped turn the tide of the battle for the Anglicans, prompting the Maiden of Versailles to take to the battlefield herself.