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. Secchia -  The Secchia (called by Pliny Gabellus) is an Italian river. It runs through Emilia-Romagna and is one of the main tributaries on the right-hand side of the Po River. It is 172 km long and has a drainage basin with a surface of 2292 km² alternating between aridity in summer and fullness in spring and autumn.
A:
Natural Place