The Tatsudomari Line is a scenic 20 km mountain and coastal road connecting Cape Tappi (Tappizaki) in Sotogahama Town with Kodomari in Nakadomari Town, in northern Aomori Prefecture. It is part of National Route 339, and is also selected as one of Japan’s Top 100 Roads.
The road features sharp curves and elevation changes, offering stunning views of the Japan Sea and the Tsugaru Peninsula. It is a favorite route for touring motorcyclists seeking both challenge and scenery.
Recommended Section
Cape Tappi to Kodomari (or reverse), approx. 20 km
A winding road running along the mountain slopes and cliffs. You can enjoy open views of the ocean and surrounding mountains. The route feels different depending on direction, so a round trip is recommended.
Road Conditions and Safety
Fully paved road with narrow mountain sections
Steep slopes and many curves—recommended to ride slowly
Be careful of falling rocks or leaves on the road surface
Closed in winter (mid-November to late April)
Points of Interest
Cape Tappi Lighthouse – Overlooks the Tsugaru Strait; you can see Hokkaido on a clear day
Staircase National Route – A famous stairway section of Route 339 (pedestrian only)
Chōkandai Observatory – Great panoramic views of the Japan Sea and Kodomari coast
Kodomari Fishing Port – A peaceful stop with fresh seafood and a local vibe
Local Food
Sea urchin (uni) rice bowls and grilled scallops near Cape Tappi
Seafood rice bowls at Kodomari’s small diners
Try igamenchi, a local squid fritter from the Tsugaru region
Fees and Access
Free to use
Accessible by car or motorcycle from Goshogawara or Aomori City (about 1.5 to 2 hours)
Best Season and Climate
Best time to visit: June to October
Cool in summer with clear ocean views
Beautiful autumn leaves in October
Road is closed in winter due to snow
Touring Plan Example
One-day ride: Goshogawara → Nakadomari → Tatsudomari Line → Cape Tappi → return (about 5–6 hours)
Overnight plan: Stay in Nakadomari or Sotogahama and continue to explore the Tsugaru Peninsula