I put in "earth" which was not accepted, however when I looked in Oceano dictionary, earth was the 2nd definition--after ground, land and terrain. the 3rd definition was plot, piece of land, lot and site.
It's abstract. Terreno is terrain. Lot is an alternate translation, but it's specifically a lot of land. If they accepted area, they could also accept region. It would get pretty far afield. Each of those already has its own counterpart in Spanish.