A vast tropical archipelago.
Thick Southeast Asian jungle--beyond Amazon-thick.
Quadruple canopies that choke off so much light that dark elves walk around during the day. Oh, also--little chameleon men.
They have drow kingdoms here--barbaric, ornamented princes. Curved daggers.
And their warrior caste goes around on dinosaurs.
Not all of them--this isn't Dinotopia--diplodocus and apatosaurus are somewhere else, the pterodactyls are mainly in the goblin empires, further north-- but the heavy brigades are all triceratops and stegosaurus, the light brigades are utahraptors (the velociraptor at riding size), the generals ride albertasaurs (riding-size T Rex) and the vain lords strut around on parasaurs, trailed by sacred ankylosaurs with gems embedded in their armor. Bringing sacrifices to an ancient, languid, despotic dracolisk.