Thanks to the efforts of John Estle of the Fairbanks Nordic Ski Club and of Mat-Su Ski Club volunteers, there are now three internationally recognized Nordic race courses at GPRA. They are a 1.3-km sprint course, and 5-km and 7.5-km courses. GPRA is now one of 33 locations in the USA with homologated Nordic ski trails. Thanks John!

See the details here:

Sprint course – 1.3-km

Hatch-Eska – 5-km course

Mitten – 7.5-km course

A Faster Skier article about homologation.