The Collaborative International Dictionary of English v.0.48:

Situate \Sit"u*ate\ (?; 135), Situated \Sit"u*a`ted\, a. [LL.
   situatus, from situare to place, fr. L. situs situation,
   site. See Site.]
   1. Having a site, situation, or location; being in a relative
      position; permanently fixed; placed; located; as, a town
      situated, or situate, on a hill or on the seashore.
      [1913 Webster]

   2. Placed; residing.
      [1913 Webster]

            Pleasure situate in hill and dale.    --Milton.
      [1913 Webster]

   Note: Situate is now less used than situated, but both are
         well authorized.
         [1913 Webster]

WordNet (r) 3.0 (2006):

situated
    adj 1: situated in a particular spot or position; "valuable
           centrally located urban land"; "strategically placed
           artillery"; "a house set on a hilltop"; "nicely situated
           on a quiet riverbank" [syn: located, placed, set,
           situated]

Moby Thesaurus II by Grady Ward, 1.0:

19 Moby Thesaurus words for "situated":
   assigned, deployed, embosomed, emplaced, ensconced, established,
   fixed, installed, located, placed, planted, positioned, posted,
   seated, set, settled, situate, spotted, stationed