is a provincial highway in eastern Ontario
which extends in a north-south direction from Highway 417
east of Casselman
to the former Highway 2
, connecting with Highway 401
as Brookdale Avenue.
Highway 138 connects to the Seaway International Bridge
, connecting Cornwall with Massena, New York
. The highway is 38 km in length.
The speed limits have been recently reduced in several areas of Highway 138 due to the abundance of deer in the area.