The Árpád Line (Hungarian: Árpád-vonal; Romanian: Linia Árpád; Ukrainian: Лінія Арпада) was a line of fortifications built in 1941-44 in the north-eastern and eastern Carpathian Mountains, along the border of Kingdom of Hungary. It was named after Árpád, the head of the Hungarian tribes. The main function of the Line was to protect Northern Transylvania (including Székely Land) and Carpathian Ruthenia from the east. The Árpád Line was the main line of defence; the Hunyad and Prinz Eugene Lines lay in front of it.