Please answer the following question: Pick one category for the following text. The options are - company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work. Ier River (Barcău) -  The Ier River or Eriu River (Hungarian: Ér) is a tributary of the Barcău River in Romania. The Andrid Dam is constructed on this river.
Answer:
Natural Place