Beyond Neptune's orbit
From FenWiki
There are many objects usually found beyond Neptune; the plutoids (Pluto, Haumea, Makemake, and Eris) and the smaller Kuiper Belt dwarf planets (including Orcus, Ixion, Huya, Varuna, Quaoar, and Sedna) are the best-known objects, but this is also the birthplace of the comets.