20,000km x 10km(200,000 square km). basically a gigantic ruler with increments every 25km, could possibly be used to test max range of planes. ever wanted to simulate circumnavigating earth? with 20,000km of land if you fly all the way to the end and back you will have successfully traveled the circumference of earth! was originally supposed to be the full circumference of earth but unity started not having a good time around 18,000 km.