The forests of Aglarond are half-elves - one of the few places where 'half-elf' has become its own sub-race (because they've been half-elves for centuries, and now 'breed true' to a half-elf every time).
I'm sure I'll think of others - I think (IIRC) Semberhome might be one.
In my one CKC article (hosted here at the keep), I created a similar 'half-elf' group just like in Aglarond (although other features became more predominate - the eyes are more elven, but the ears are nearly round like a humans). They reside in the Punjabbi* Islands north of Katashaka and south of Maztica.
*If I ever get an opportunity to rename those islands, they are going to become the 'Punjaffi' instead).
"I have never in my life learned anything from any man who agreed with me" --- Dudley Field Malone
Depends on what you counts as "large" and "half-elf" (majority?.. substantial part?.. just many of them in one place?.. all subraces?), the list could include Dambrath and Silverymoon. Also, Dambrath was founded by an order of half-elven Loviatar worshippers, so there may be more to it.
People never wonder How the world goes round -Helloween And even I make no pretense Of having more than common sense -R.W.Wood It's not good, Eric. It's a gazebo. -Ed Whitchurch