Rumoi

Rumoi is a city in Rumoi Subprefecture, Hokkaido, Japan, Japan. Its local government is styled Rumoi-shi in Japanese. As of 31 January 2025, the city had an estimated population of 18,132 people living in 10519 households, with a population density of 61 people per square kilometre, across a total area of 297.81 square kilometres. The article reports several theories about the origin of the name, which comes from the Ainu word for the Rumoi River; the theory adopted by the city holds that the Ainu word means a river with calm, constant tides. The entry is kept apart from other places of the same name by its prefecture, and in the geography atlas the city is placed with the cities of Eastern Asia, under Japan, where its population and area can be compared with those of other Japanese cities.