 The Sawara Line, a 35 km loop line from Ōnuma to Mori opened in 1945, is included as part of the Hakodate Main Line.The Sapporo—Minami-Otaru section was the first railway line opened in Hokkaido (including the Minami-Otaru - Temiya Line to the Otaru Port).The line was extended as the first to connect to Hakodate, though today all Sapporo—Hakodate direct passenger and freight services travel via the Chitose and Muroran lines until rejoining the Hakodate line at Oshamambe Station.