The Outer Rim
The Outer Rim is a series of five Flat Dimensions considered to be "close" to Arindell, and thus easily reached by magic. The five worlds are (were) called: Kai Chi, Pem Farheuill, Lim Phat, Nos Vorm, and Kordron. About a dozen considerably smaller worlds, called The Inner Rim, lay even closer. The rest of the region in the form of Finite Dimensions.
Each of this worlds belongs to a different Domain, with all of the small flat worlds around Arindell belonging to the same Domain. Together, they constitute six of the seven known domains.