The English Channel is a body of water between England and France on Earth.
The Channel Tunnel ran underneath the English Channel. (ST novel: The Rise and Fall of Khan Noonien Singh, Volume 2)
When he was a child, Jean-Luc Picard often dreamed he was a World War II fighter pilot who was forced to bail out of his Royal Air Force aircraft over the English Channel. (TNG novel: Requiem)
Julian Bashir and Miles O'Brien's holoprogram of the Battle of Britain featured aerial combat over the English Channel between the RAF and the Germans. The character of Clive crashed his plane into the English Channel and was killed. (DS9 episodes: "Looking for par'Mach in All the Wrong Places", "Homefront", "Accession")