The correct answer is - waterfall.
Ñacunday National Park is a national park located in the South American country of Paraguay. The name derives from the district in which it is located, the district of Ñacunday, Alto Parana.
This national park is spread out on a territory of 20 square km, so it is relatively small one, but it is till a very attractive one. The main attraction of the national park is the Salto Ñacunday waterfall, which is a grandiose waterfall with height between 35 and 40 meters, and width of around 110 meters. The area surrounding the waterfall is covered with dense tropical rainforest, very rich in both flora and fauna.