Please answer the following question: Marro - The Marro is an Italian river in the province of Reggio Calabria. Its source is south of Cittanova and north of the Aspromonte. It has two tributaries which flow north from their sources in the Aspromonte into the Marro. The Marro flows northwest and empties into the Tyrrhenian Sea near Gioia Tauro. 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