Route: Cerro de Sirena (Guanajuato, Mexico)

Cerro de Sirena (2404m) is the highest of the hills surrounding Guanajuato, in central Mexico.  For the FKT, start in front of Teatro Juarez, run to the cross at the top of "La Sirena" (about 3km, 480m gain), and return to your starting point. There are many possible variations.