When I put way too much weight into the word Harad.
I’ve a headcanon that the world of Damar is actually the same as that of Middle-earth; just that the names don’t line up because of course the folks that call it Middle-earth are speaking the common western tongue.
Compounded by the fact that we are reading the history of the one ring as told by the Hobbits, who are inherently unreliable narrators because they are not well traveled. The story is meant in its lore to be Hobbit centric. They don’t know much about the world beyond the Shire and even many of the men and elves they get their information from along the way don’t go terribly far south; or east either.
Even Gandalf does not go east!
Aragorn does go east, and south as well, but he says little about what he saw except that the stars are strange.
So of course they generalize Harad on a map. So of course they figure all the East and South are under the will of Mordor. After all, that’s the general consensus in the West unless you go ask (book) Samwise or (movie) Faramir his opinion about the enemy warriors.
Regardless, why would any of them know of a hilly semi arid land circled in the north by high impenetrable mountains where the dark haired, cinnamon skinned people call themselves Damarians after the name they have for their land in their own tongue. Why would anything be said in the West of the long standing feud the Damarians have with the demon kind who live north of the mountains? Or of the frequent threat of subjugation by cruel inhuman armies mounted on nightmare beasts from the north?
Besides, Sauron would certainly not let it be known one little land full of stubborn horsemen with large hunting cats and dogs and horses to rival the Mearas ( except in the ability to speak), was giving him grief. Especially, with revenge and locating the ring higher up in priority.
That said, it is also a place intermittently looked after by a semi immortal man who was schooled in the way of wizardly arts. Who says his teacher could almost remember the hanging of the moon in the sky. Tolkien is said to have hinted that there may be more wizards than the famous five Istari and that the Blue Wizards may have founded schools in the east.
Damar is also the home of a girl who killed the Black Dragon, supposedly the last of the great dragons who could blot out the sky. A dragon who is personally responsible for the desertification of a large portion of their region and who's speech is very dangerous to any who hear it.
“A Pool in the Desert” in which a character finds Damar on the modern Homelander map, which is pretty heavily implied to be part of our world, made me think of how Middle-Earth is supposed to be an alternate history of Earth; how the world building rules are not dissimilar. Then there is the similarity of Damar to the arid lands of Harad and of course the trivial resemblance of the name Angharad (it's Welsh apparently, Tolkien would probably have approved). So since Tolkien never got around to thinking of stories about the unmapped Middle East-esque area on his map of Middle-Earth, I’m plugging in the handiest substitute.