4.2 km (2.6 mi) east of Morrisons Beach Road on the Fleur-de-Lis Trail, one comes to a bridge across a relatively narrow stream of water joining two large bodies of water on either side of the road. From this web site, one learns that the bridge bears the name “Fullers River Bridge”, which sort of implies that the stream of water is the Fullers River. The Nova Scotia Atlas, on the other hand, shows the MacKenzies River on the north side of the bridge and Fullers River on the south side of the bridge, with the former flowing into the latter south of the bridge.
In any case, this is a view to the north of the MacKenzies River, which rises in Goose Lake just north of the Cape Breton County line. As this Google aerial view shows starkly, there are great mud flats on both sides of the bridge, one of which can be seen in the centre left of this photo.