Acher - The Acher is a river in the district of Ortenau Baden-Wurttemberg Germany and a right tributary of the Rhine River. It flows in an eastwesterly direction from the Black Forest toward the Rhine between the Rench River to the South and the Oos River to the North.Its source is located near the top of Schliffkopf Mountain (Black Forest) at an elevation of 1054 metres (3458 ft) above sea level above Ottenhofen. Given a choice of categories company, educational institution, artist, athlete, office holder, mean of transportation, building, natural place, village, animal, plant, album, film or written work, the text refers to which one?
A:
Natural Place