Which preposition to use with var

on Occurrences 1%

part of Provence, bounded by Hautes-Alpes on the N. and Var on the S., sterile in the N., fertile in the S., cap.

over Occurrences 1%

We saw the desolate hills of Uam-var over which the stag fled from his lair in Glenartney, and keeping on through Callander, stopped for the night at a little inn on the banks of the Teith.

Which preposition to use with  var