South America the Darién watershed along the Colombia–Panama border, although some may consider the border instead to be the Panama Canal. Geopolitically and geographically all of Panama – including the segment east of the Panama Canal in the isthmus – is typically included in North America alone and among the countries of Central America. Almost all of mainland South America sits on the South American Plate. South America is home to the world's highest uninterrupted waterfall, Angel Falls in Venezuela; the highest single drop waterfall Kaieteur Falls in Guyana; the largest river (by volume), the Amazon River; the longest mountain range, the
South American Cross Country Championships competition schedule featured long races for senior men and women, and shorter races for junior men and women. This was expanded in 1991 with the addition of a youth competition for younger runners. Keeping in line with changes to the IAAF World Cross Country Championships, the South American championships also held senior short race competitions between 1998–2006, to complement the established long races. The short races were removed from the programme after their removal from the World Championships in 2006. Brazil have been the most successful nation at the championships: they were undefeated in both of the long race team