the Serranía Cerro Corá, Tacurupytá, Guasú, Alambique, Tuna and Tangaró. Some isolated hills are: Tranquerita, Tacuara, Verón Cué and Cuatiá. Hydrography The Apa River delimits the territory to the North, just as the Estrella Stream does with Brazil. The Aquidabán River and the streams Tapiracuai, Aquidabán-mi, Cabayu and Guazú are also in Amambay. The West of the department is bordered by the Ypané River and others such as Tutytí, Aguaray Verde, Puente de la Tabla Puendy and Ypané-mi. Natural environment The entire department belongs to the Ecological Region of Amambay. The ecosystem has a great variety of fauna and flora. The richness natural resources in the region causes the department to be highly affected by deforestation. Some species of plants currently in danger of extinction include local palm tree species, karanday (Copernicia alba), array, Amambay fern, trébol, yvyra paje, kai kygua, and local cedars. In addition, there are some animal species that are in danger too: agua’a sayju, jacaré ita, and guasuti. The protected areas are: Estrella Forest: 30.000 hectares Pira’y Forest: 22.500 hectares Guasú Hill: 15.000 hectares Sarambí Hill: 15.000 hectares. Cerro Corá National Park was created by decree No. 20.698 on February 11, 1976, with a surface of 12.038 hectares. It is located in Pedro Juan Caballero's district. Tourism Amambay is a department very favored by nature's beauty. Amambay Cordillera forms a chain of mountains: Cerro Corá, Tacurý Pytá, Guasú and Alambique. The most important hills are: Cerro Corá, located in the National Park, Acuá, Lorito, Guasú, Muralle and Sarambí. In Cerro Corá, on the banks of Aquidabán Nigui River in 1870 an historic event took place: the death of Marshal Francisco Solano López, in the Battle of Cerro Corá. In the National Park, there is a monument to him. In Cerro Guasú, Yasuká Verá, there are caverns and rests of human artifacts of archeological importance that date from 2.500 to 3.800 years ago. Tapé Tuyá is a road the remaining Paraguayan army took in the campaign of 1896–1870. The area was inhabited by colonies of natives of the Tupí Guaraní Family, the Paí Tavyterá and Ava Guaraní. There is a hill in there that was considered to be a holy place by the Ava Guaraní. They thought it was the center of the earth, where the world was created and were born the first man and the first woman. In Pedro Juan Caballero, the beaches in the