Q:Nosivolo River -  The Nosivolo River is a river in eastern Madagascar and a primary tributary of the Mangoro River. It begins east of Fandriana. The village of Marolambo capital of the Marolambo District in the Atsinanana region is located along the river at the junction with the Sandranamby River.It is an important river in Madagascar due to its biodiversity (including the cichlids Katria katria and Oxylapia polli and Malagasy rainbowfish) which has spurred efforts to protect it. 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