is a town located in Iburi, Hokkaido, Japan. As of September 2016, the town had a population of 17,759. It was established in 1867 by the feudal lords of Sendai. Most of the area of the town is forested and parts lie within the Shikotsu-Tōya National Park. History Shiraoi, like the rest of Hokkaido, was populated by the Ainu. According to the town's official website, the name, Shiraoi, means Rainbows in the Ainu language. Other sources state that the name comes from Shiraunai meaning Horse-flies. In 1867, the Sendai domain established a fort in Shiraoi and work began on . The following year the Boshin War caused Sendai to retreat from Shiraoi and return to Sendai proper. After the revolt was put down the government dismantled the fort in 1870. The end of the 19th century saw expansion of the town. A road was established connecting Shiraoi with Muroran, Sapporo, and Hakodate in 1873. Nineteen years later, the first railroad station was established. The villages of Shadai and Shikiu were established. Two significant events occurred during this expansion: in 1874, Mount Tarumae erupted, and in 1881, the Emperor Meiji visited. Geography The total area is . The town is East to West and North to South. 82% of this area is forested. Shiraoi is crossed by a number of rivers running from the mountains like Mount Horohoro to the Pacific Ocean. These include: Shadai River Shiraoi River Shikyu River Betsubetsu River Mount Horohoro and Lake Kuttara are part of Shikotsu-Tōya National Park. Lake Poroto is also in the area. Climate Shiraoi has an oceanic climate, mild when compared to the rest of Hokkaido. The annual temperature ranges between the extremes of and . The average annual temperature is . Shiraoi receives of precipitation annually. This only results in of snow annually. In a typical year, the snow lingers for 80 days. Accumulated snow rarely exceeding . Wind velocity averages merely , that is less than half of the neighboring Tomakomai and Muroran. Demographics Shiraoi has a density of 42 persons per km². Economy In the 1930s, Shiraoi began the cultivation of mushrooms, such as Shiitake, and mullet roe (or karasumi) at Kojohama. Shiraoi imported the knowledge of mullet roe production from Iwanai. Shiraoi has been involved in the harvest of marine products such as the Horsehair crab and konbu. Because of dwindling resources, harvesting of hair crab has been reduced