southeastern

from WordNet (r) 3.0 (2006)

southeastern
    adj 1: situated in or oriented toward the southeast [syn:
           {southeast}, {southeastern}, {southeasterly}]
    2: of a region of the United States generally including Alabama;
       Georgia; Florida; Tennessee; South Carolina; North Carolina

from The Collaborative International Dictionary of English v.0.48

Southeastern \South`east"ern\, a.
   Of or pertaining to the southeast; southeasterly.
   [1913 Webster] Southeastward