The English Channel (Le Manche in French).
Ferry and/or train (Channel tunnel)
You can either fly, or take the Eurostar which is a high speed train which travels under the English Channel.
About 2.5 hours
9000 KM
You can't travel directly from Gatwick to Paris by train. You will have to take a train to London St Pancras and then get on another train to Paris. Unbelievably, you can't fly from Gatwick Airport to Paris either.
There is not any direct rail connection between Belfast and France. You will need to travel via London, using ferry service. It will cost you $90 to travel from Belfast to London (ferry and train both), and another $117 to travel to Paris from London via train.
The Eurostar travels between London and Paris, and between London and Brussels. It does not travel between Paris and Geneva.
A train journey from Moscow to London is possible but not directly. As London is on the British Isles, the only connector for trains is across the English Channel to Paris.
The Eurostar does not go to Barcelona. Eurostar is the brand name of the high speed train service London-Paris and London-Lille-Brussels.
Paris to London: 213 mls / 343 kms bee-line flight time: London Heathrow - Paris Ch. De Gaulle: 1h 10m train travel: London St.Pancras - Paris Gare du Nord: 2h 35m road travel: 250 mls / 402 kms: est. 5h 15m
The Eurostar travels between London and Paris, and between London and Brussels. It does not travel between London and Geneva.
The Eurostar goes from Paris to London, it doesn't go to Dublin.