We have had two opportunities to cross the channel into France. The channel crossing ferries are located in Dover, England and take you to Calais, France. We will have yet another chance this December when we travel to Austria for Christmas.
This is a picture of one of the ferries. They are quite big as they transport tractor trailers, buses and cars.
This is a picture aboard the ferry looking to the English border. The waters are normally choppy and its quite windy aboard, but they have lovely places to sit and eat not to mention many gift shops.