Elsweyr. Yay kitties!
Though the Black Marsh would also be a cool place, just from the way it's described and the fact I love beast races. You could have the story be like a new plague that also affects the Argonians so they accept the outsiders help to look for a cure or something. I don't know if they would go with all the lore though, I just know the basics. Then they can just copy paste Skyrims factions of welcoming outsiders but having to give up a few traditions or being xenophobic dicks (guess which I chose lol).
Though the Black Marsh would also be a cool place, just from the way it's described and the fact I love beast races. You could have the story be like a new plague that also affects the Argonians so they accept the outsiders help to look for a cure or something. I don't know if they would go with all the lore though, I just know the basics. Then they can just copy paste Skyrims factions of welcoming outsiders but having to give up a few traditions or being xenophobic dicks (guess which I chose lol).