Japan National Route 340

National Route 340 (国道340号) is a national highway of Japan connecting the cities of Rikuzentakata, in southeastern Iwate Prefecture, and Hachinohe, in southeastern Aomori Prefecture. It travels south to north and has a total length of 246.2 km. It serves primarily as an alternate, inland route to National Route 45 through the northeastern part of the Tōhoku region.

Route description
National Route 340 has a total length of 246.2 km.

History
National Route 340 was established by the Cabinet of Japan in 1975 between Rikuzentaka and Hachinohe.

Major intersections
All junctions listed are at-grade intersections unless noted otherwise.