A stories at first require a risky venture of mining heir David Innes & his discoverer friend Abner Perry fallowing it apply an cast-iron mole to tunnel D miles into a globe's crust. Late protagonists include forearm cave human Tanar & extra visitant from either a superficial globe, notably Tarzan, Jason Gridley & Von Horst.

Original map of Pellucidar, from the first edition of Pellucidar (1915)

Geography
Within Burroughs' construct, a Globe occurs when hollow scale by using Pellucidar as a internal surface of that casing. Pellucidar is accessible to the superficial globe vithe a polar opening allowing passage between the inner & outer worlds, across which a rigid dirigible visits Pellucidar in the third book of the series. Although a inner surface of a Globe hwhen an absolutely little region than the outer, Pellucidar actually has a greater acreage, as its continents mirror the surface globe's oceans & its oceans mirror a superficial continents.

The peculiarity of Pellucidar's geographics is that due to a concave curvature of its surface no horizon; a farther distant something is, the higher it appears to become, until these are eventually misplaced in the atmospherical haze.

Pellucidar is lit by a miniature sun suspended at the super center of the hollow sphere, and so that these are profits perpetually overhead wherever 1 is around Pellucidar. a resole exception is the vicinity directly under the petite geostationary moon of the internal sun, which lies under a perpetual occultation & is referred to as the Land of Awful Shadow. This moon has its have plant & (presumptively) fleshly life, & hence either has its have atmosphere or even shares that of Pellucidar. A miniature sun never changes within brightness, & naturally never sets; and then sustaining there are no nightperiod or even seasonal progression, a indigen develop little conception of time. A cases of the series indicate that period is as a matter of fact bands, pass at different rates inside different areas of Pellucidar.

Culture
Pellucidar is populated by primitive humans & prehistoric animals, notably dinosaurs. A locality where Innes & Perry at the start buy themselves is ruled per cites of the Mahars, intelligent flying reptiles resembling pterodactyls with unsafe psychic powers, who keep a local tribelets of Stone Age human beings in subjection. Innes & Perry finally unite the tribes to overthrow a Mahars & establish a person "Empire of Pellucidar" inside is place.

When a Mahars come a dominant coinage in the Pellucidar novels, it seem confined to their handful of cities. Prior to their overthrow it use a Sagoths, a race of gorilla-men world health organization speak the equivalent language of Tarzan's apes, to enforce their rule across a individual tribes inside a metropolitan area ended which it hang on to sway.

Two in & & outside a Mahars' domain come scattered independent man cultures, virtually all of a two at the stone age level of development. Exceptions include a Korsars (corsairs), the marine marauding society descended from either surface-globe pirates, and a Xerots, an forearm Bronze Age civilization. Everthing or even virtually all of the human being habitant of Pellucidar part the most common globe-wide language.

Pellucidar likewise harbors enclaves of various nonindividual or even semi-human races. Besides a Sagoths there are triad known ape-prefer races. A Ape Men & Sabertooth Men come two black by using prehensile tales, through a previous come tree-shaped & the latter come man-eater by having dagger-rather tusks. A Brute-Men come peaceful, gorilla-such as farmers. 2 subterranean races come a Coripies or buried humans, short unseeing carrion eaters, & a Gorbuses, cannibalistic albinos globe health organization come apparently resurrected surface-world liquidator. More metal money seen include a Azarians, primitive human-eating giants, a Ganaks, a race of horned bison men, & the Horibs, furious, dinosaur-riding reptilian men.

The Novels