Japan National Route 338 partially coincident with Japan National Route 279
Aomori Prefecture
The highway is next carried south across the Tsugaru Strait via the Tsugaru Kaikyō Ferry to Ōma on the northern tip of Aomori Prefecture's Shimokita Peninsula. From the route's northern terminus in Hakodate to Ōma, National Route 338 runs concurrent with National Route 279; however, in Ōma, National Route 279 leaves the concurrency, travelling southeast towards Mutsu while National Route 338 heads south towards the village of Sai. After passing through Sai, the highway enters the western edge of Mutsu and turns east towards the center of the city.
In Mutsu, national routes 279 and 338 briefly meet again, sharing a short concurrency. After leaving the concurrency, National Route 338 continues its path southeast across the peninsula while National Route 279 heads south towards Noheji at the southern base of the peninsula. National Route 338 parallels the Pacific coast for the rest of its route south through Higashidōri, Rokkasho, and Misawa before terminating in Oirase.
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