From the back cover of the rule book
Fantasy Role-Playing Adventures in the World of Man of Gold and Flamesong.
Tékumel, the world of fantasy and adventure. The setting for this fantasy campaign game is an alien planet, Tékumel, where a cosmic cataclysm stranded human and extra-territorial invaders eons past. A hostile world of poisonous flora and fauna, with intelligent and vengeful native races! Mankind and its allies must battle for survival with nothing save Medieval technology--but magic aids them...and there are certain supernatural powers which may intervene.
New, Easy-to-Play, One Volume Edition, complete and unabridged.
With Introduction by Dave Arneson and Foreword by Gary Gygax.