It's the South American country whose capital city lies the closest to 0 degrees latitude
The largest country in South America by far, in both area and 
population,... [DOC] [TLE] Extreme points of Earth - Wikipedia [PAR] This is a list of extreme points of Earth, the points that are farther north or south 
than, higher or lower in elevation than, or farthest inland or out to sea from, any 
other locations on the landmasses, continents or countries.