sentences:  It is surrounded by over 1,000 smaller islands and islets.The greatest distance between two points is (between Land's End, Cornwall and John o' Groats, Caithness), by road.The English Channel is thought to have been created between 450,000 and 180,000 years ago by two catastrophic glacial lake outburst floods caused by the breaching of the Weald-Artois Anticline, a ridge that held back a large proglacial lake, now submerged under the North Sea.