Nehrung.

From East Prussian Middle High German nerunge, neringe (“spit”, 15th c.), earlier nerige, nerge (14th c.). Cognate with Old Prussian neria, Lithuanian nerija (both “spit”). Further origin uncertain. * Assuming German origin, from the adjective Proto-Germanic *narwaz (“narrow”), related with German Narbe (“scar”). If the form without -n- is original, it may be derived with the Germanic suffix *-į̄, thus *narwį̄ (literally “narrowness”). If the form with -n- is original, it may be derived with the suffix *-ingaz commonly used in placenames (compare German -ingen). * Baltic origin is more likely on the face of it, but the proposed derivation from Proto-Balto-Slavic *nerˀtei (“to dive”) is not entirely convincing. * It has also been posited that a Proto-Germanic *narjō (“strait or headland”), related with the adjective above, was first borrowed into Baltic and thence later into German. Said noun is, however, not attested anywhere and has only nebulously been identified in Scandinavian placenames.