Geography of South America world by drainage area—the Amazon River and the more southerly Paraná River. The other major river of this central lowland is the Orinoco River, which has a natural channel linking it with the Amazon. Most of this central lowland is sparsely populated because the soils are heavily leached, but in the south is the very fertile pampas of Argentina—one of the world's major food-producing regions where wheat and beef cattle are pre-eminent. The natural vegetation of the northern lowlands are either savanna in the northern "llanos" and southern "campos", or tropical rainforest throughout most of the Amazon basin. Efforts to
LGBT rights in Argentina 100,000 people took part in the festivities. Outside Buenos Aires, there are visible LGBT scenes in Córdoba, Rosario, Mendoza, Puerto Madryn, Ushuaia, and Mar del Plata. In May 2015, PlanetRomeo, an LGBT social network, ranked Argentina as the second happiest South American country for gay men, after Uruguay. A 2013 Pew Center Research opinion poll ranked Argentina the most positive Latin American country in regards to societal attitudes towards homosexuality, with about three-quarters (74%) of those surveyed saying it should be accepted. A majority of Argentinians support the legalisation of same-sex marriage. LGBT rights in Argentina Lesbian, gay, bisexual, and