Rumoi is home to some of the largest waves in the world and is ranked among the top three locations for high waves worldwide. In October of 1985, waves reached a record-breaking height of 12 meters! Besides its role as an international trade port, Rumoi port is important to the industry and livelihood of the people of northern Hokkaido. Many fish frequent this large, deep port, making it a popular spot for fishing. Tetrapods weighing 80 tons are piled along the breakwater to protect Rumoi port from the massive waves. If you get close enough to these huge blocks, you can imagine why they are able to break up the power of some of the biggest waves in the world.
⑰Sandomari Harbor（Sandomaricho, Rumoi）
This small fishing port is located immediately north of the bustling Rumoi Port, but the atmosphere here is quiet and calm.
⑱Onishika Harbor（Onishika-minatomachi, Obira）
The warm currents that flow through the Sea of Japan and the naturally sandy coastline here make it possible to have swimming beaches here. Onishika Twin Beach has a large sundial in its center which reflects the warm rays of the setting sun.
⑲Tomamae Harbor（Tomamaecho, Tomamae）
This harbor in northern Rumoi sub-prefecture is the center of a prosperous scallop industry. There is a double-sided deck along the breakwater on the east side from which you can enjoy the beautiful seascape. The roadside rest area located above the harbor along the national route is also where the main facility and hotspring Tomamae Fuwatto stands. Adjacent facilities Yuhigaoka Auto-Campground, White Beach and Miraiko Park are also popular outdoor spots for family fun.
⑳Haboro Harbor（Minatomachi, Haboro）
The Haboro Shore Ferry company operates ferries year round which link Yagishiri and Teuri islands with the mainland ferry terminal in Haboro. Express ferries also run from April to August. The ferry goes to Teuri via Yagishiri with a travel time of 1 hour 25 minutes (35 minutes by express ferry) from the terminal to Yagishiri, and 15 minutes between Yagishiri and Teuri.