Abashiri Ko (Abasiri Ko), a harbor protected by breakwaters, is situated at the mouth of the Abashiri Gawa, 5.5 miles SSE of Notoro Misaki. This is a regulated port and a designated port of entry and local port. The port within the breakwaters is known as the Inner Port; the area outside the breakwaters is known as the Outer Port. There is an outer detached S breakwater. A light is shown 0.2 mile SW from the elbow in the S breakwater. This is the largest port on the N coast and serves as the base for the Okhotsk Sea fishing fleet. There is heavy fishing boat traffic from September to November, which is the mackerel-pike season.

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