Eberron and on...
“The jungles of Xen’drik are rife with crumbling ruins—the ziggurats of Kembe, the flying city of Kho, and poor, doomed Holy Xatramba. But none of these ancient relics have inspired the imaginations of adventurers and scholars more than Saventh-Yhi, the legendary lost city of the
Azlanti and the only outpost of that vanished race so far south in Garund’s dark interior. Saventh-Yhi’s discovery would be the crowni ng achievement of any explorer’s career, and gods know enough have tried to find it and failed. The fetid jungles of Xen’drik hold many secrets, but perhaps some cities are lost for a reason.
Think about that as you’re being devoured by some toothed monstrosity beneath the dripping canopy."
—Lilae Kurundi, A Fool’s Errand: Ruins and Relics of Xen’drik