The Duindir were an ancient Midron tribe that lived in what is now known as the “lowlands” of Leilior.

The region now known as Leilior was originally occupied by two tribes—one Midron (the Duindir) and one Northron (the Rhuadir). The Duindir were mostly based in the Slayt Mountains and have largely died out, their only remnants are their language (modern Leilioran) and the original Midron racial stock of the region.