Saint Nectan's Kieve in Saint Nectan's Glen, near Tintagel in Cornwall, Great Britain, is a plunge pool or basin fed by a 60-foot-high waterfall on the Trevillet River.
Wikipedia https://en.wikipedia.org/wiki/St_Nectan's_Kieve
Address (Unnamed Road), PL34 0, United Kingdom
Coordinates 50°39'52.765" N -4°42'58.549" E