Japan National Route 279 partially coincident with Japan National Route 338
Aomori Prefecture
The highway is then 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 338 leaves the concurrency, traveling south while Route 279 heads southeast towards Mutsu. In Aomori, Route 279 is known as the Mutsu Hamanasu Line, named after the hamanasu, known in English as the Rosa rugosa, a shrub-like rose that grows on the beaches of Japan.In Mutsu, it intersects with the northern end of the Mutsu Bypass, an auxiliary parallel route of the highway, and routes 279 and 338 briefly meet again, sharing a short concurrency. After traveling through the central district of the city together, National Route 338 leaves National Route 279 at the southern end of the Mutsu Bypass. It continues its path southeast across the peninsula while National Route 279 heads south towards Yokohama, and eventually Noheji at the southern base of the peninsula. The highway reaches a rest area on the north shore of the Miho River in Yokohama. Between Yokohama and Noheji, National Route 279 is closely paralleled by the Shimokita Expressway, a highway signed as an auxiliary route of National Route 279 that has supplanted the original route as the main thoroughfare between Yokohama and Noheji. The two highways meet at junction in southern Yokohama, where the original route continues south along Mutsu Bay while the expressway takes a more inland route through the village of Rokkasho. Upon entering Noheji, the route travels southwest through sparsely populated coastal woodlands before entering the central part of the town where it curves to the south. After passing by the town hall, the route terminates at an intersection with National Route 4.
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