The Celtic nations or Celtic countries are a cultural area and collection of geographical regions in Northwestern Europe where the Celtic languages and cultural traits have survived. The term nation is used in its original sense to mean a people who share a common identity and culture and are identified with a traditional territory.
Pipers at the Festival Interceltique de Lorient
Celtic Cross of Partridge Island, Canada
In anthropology and geography, a cultural area, cultural region, cultural sphere, or culture area refers to a geography with one relatively homogeneous human activity or complex of activities (culture). Such activities are often associated with an ethnolinguistic group and with the territory it inhabits. Specific cultures often do not limit their geographic coverage to the borders of a nation state, or to smaller subdivisions of a state.
Cultural areas of Africa as defined by Melville J. Herskovits