Amazon river dolphin widespread river dolphins. They are present in six countries in South America: Bolivia, Brazil, Colombia, Ecuador, Peru, and Venezuela, in an area covering about . The boundaries are set by waterfalls, such as the Xingu and Tapajós rivers in Brazil, as well as very shallow water. A series of rapids and waterfalls in the Madeira River have isolated one population, recognized as the subspecies "I. g. boliviensis", in the southern part of the Amazon basin in Bolivia. They are also distributed in the basin of the Orinoco River, except the Caroni River and the upper Caura River in Venezuela. The
South American Championships in Athletics the modern Olympic Games. The 1948 event was held in celebration of the 100th anniversary of the foundation of La Paz. The 1950 event was held in celebration of the 30th anniversary of the Uruguayan Athletics Federation. The 1957 event was for men only. Countries are measured by a points system resulting from their respective athletes' performances. The country with the highest total points is declared the winner. List of South American Championships in Athletics records South American Championships in Athletics The South American Championships in Athletics is a biennial athletics event organized by CONSUDATLE. The first edition in 1919