Q:Sinni (river) - The Sinni (Latin: Siris or Sinis; Greek: or ) is a 94 km long river in southern Italy. It flows through the region of Basilicata and into the Ionian Sea near Policoro; in antiquity the city of Siris lay at its mouth.Near the town of Senise a dam on the river was built in 1970-1982 tha largest in Europe built with earth. In correspondence of it it forms the Lake Monte Cotugno one of the largest artificial basins in Italy. 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