Shin Nihonkai Ferry Co., Ltd. (sailing between Maizuru and Otaru; Tsuruga and Tomakomai with stops at Niigata and Akita in between [direct service is also available]; Niigata and Otaru)
新日本海フェリー（舞鶴-小樽、敦賀-新潟-秋田-苫小牧（直行便もある）、新潟-小樽）