You'd need to cross the English Channel to go from London to Paris. If you're going by rail, you cannot cross OVER the Channel - but you can cross UNDER it. To Vienna, you'll cross a great number of rivers, but the most important is probably the Rhine. Lots of bridges that way.
English channel
The Eurostar travel time from London to Paris is approximately 2 hours and 15 minutes.
The Eurostar train takes around 2 hours and 15 minutes to travel from London to Paris.
what direction would you travel to go from paris to london what country are each located
The average Eurostar travel time between London and Paris is around 2 hours and 15 minutes.
Depending on the route of your travel London to Paris is about 285-308 miles.
north-west
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
north-west
for travelling from paris to london what entery document is needed visa or entery pass as i am a doctor and is attendin conference in paris and have come from pakistan and want to visit london as will
The Channel Tunnel
About 2.5 hours