This track in Argentina is around the Lake Potrero de los Funes. It is
over 6 km in length. Of the tracks I have done, only the Nürburgring
Nordschleife ("Northern Loop") and Circuit des 24 Heures du Mans (Le
Mans) are longer.
I included a map overlay, two polygons for the
original and current versions of the track, a path for pit road,
placemarks for each turn, and more.
You can get the KMZ here
I knew there was a track in the area of Río Cuarto, Argentina. But it
took some work to find it. All I had was a mysterious link in a
Wikipedia box listing ciruits for Turismo Carretera and it mentioned Río
Cuarto. The Río Cuarto page on Wikipedia didn't mention any track.
I had no name, no coordinates. I put "Autódromo Río Cuarto" into
Google and got a hit. So I was able to make a map which became an
overlay. To that, I added 6 polygons for track configurations, a path
for pit road, placemarks for each turn, and more.
I then added 4
polygons and a path for a kart track plus placemarks for each turn
there. You can get the KMZ here