Tantallon Castle is a mid-14t-century fortress, located 5 km (3.1 mi) east o North Berwick, in East Lowden, Scotland. It sits atop a promontory opposite the Bass Rock, leukin oot ontae the Firth o Forth. The last medieval curtain wall castle tae be constructit in Scotland, Tantallon comprises a single wall blockin aff the headland, wi the ither three sides naturally protectit bi sea cliffs.