This unusual landmark of a holed island with its corrupted name means the Island (Enys) of Grass/Turf (Tonn) of which it probably had enough for a small field when so named but has dwindled in size both as an island and turfed top! behind it you see the rock called 'the Armed Knight' which is said, in Norman times , to have had a metal iron structure on top for some reason, perhaps as a brazier with fire to warn shipping, I don't know.
