The Isles of Scilly are the northernmost boundary of the Western Approaches of the English Channel. During the Age of Sail the overwhelming majority of British and Continental shipping exited the English Channel using the southern landmark, Ushant, as the point of departure for destinations in the West Indies, the Americas, and the Far East.
Both these landfalls are memorialized in the sea shanty Spanish Ladies:
We will rant and we’ll roar like true British sailors,
We’ll rant and we’ll roar all on the salt sea.
Until we strike soundings in the channel of old England;
From Ushant to Scilly is thirty five leagues.