Hey there! I'm happy to help!
South America gets very close to Antarctica. Tierra del Fuego and the Strait of Magellan are very close to Antarctica if you look at a map.
The Antarctic circle is at 66.5° S. We know that these areas aren't technically in Antarctica, but they are pretty close. Each degree is about 60 miles, so it makes sense that these areas might be about 390 miles away (6.5 degrees). Something like 55 or 45 would be way too far away (690 and 1290 miles respectively).
So, the approximate latitude of South America's southernmost point is about 60 degrees South.
Have a wonderful day and keep on learning! :D
