Route 845 follows the southern shore of the Kingston Peninsula along the Kennebecasis River past Clifton Royal and Chapel Grove.

Next is the community of Summerville, which has a seasonal ferry to Millidgeville, in Saint John.

The road curves northward at Lands End opposite Grand Bay-Westfield, where a third ferry to Grand Bay-Westfield leaves from the Hardings Point Landing Road.

The second half of Route 845 runs northeasterly along the Saint John River from Hardings Point back to Kingston.

Route 845 terminates at Kingston Corner where it meets itself, basically forming one huge rectangular loop.