seems that major human/Denisovan mating took place only in Oceania, but their intermingled descendants failed to return to mainland Asia, perhaps stopped by the Wallace line (an ecologically famous division caused by deep ocean straits, which we shall meet at the end of the Sloth’s Tale). That’s not to say there was literally no interbreeding elsewhere though. There are plausible claims that Tibetans, living between the two regions, inherited genes for high-altitude adaptation from Denisovans.
