The Chokai Blue Line is a sightseeing mountain road that rises from 0 meters to 1,100 meters above sea level. It is a driving course (total length 34.9 km) that connects National Route 7 overlooking the Sea of Japan with Nikaho City, Akita Prefecture, and Yusa Town, Yamagata Prefecture, offering views of the blue waters of the Sea of Japan below, Tobishima and Sado Island in the distance, and the Oga Peninsula in the far distance. The Chokai Blue Line, a sightseeing mountain road that had been closed during the winter, opened to traffic in late April and will remain open until early November. After the opening, visitors can drive through the snow corridor until early May. In addition, since the line is partially opened early, skunk cabbage colonies can be seen from mid to late April.