The only form of relief are the tepuis, that are plateaus which are unique features, among which are its vertical and nearly flat tops, although there are several tepuies that do not meet these rules. Geologically are remnants of a sedimentary cover composed of very ancient sandstone that is superimposed on a base of igneous rocks (mainly granite) that is even older (nearly 3 billion years). On its summit is home to a very substantial amount of very specific endemic species, both plant and animal.