is a subprefecture of Hokkaido Prefecture, Japan. Its population is estimated to be 77,500 as of July 31, 2004 and its area is . It is the northernmost subprefecture of Japan. Wakkanai Airport is located in Wakkanai. Rishiri Airport is located in Rishirifuji, Rishiri District. Geography Municipalities Mergers History 1897: Sōya Subprefecture established; Sōya, Esashi, Rishiri, Rebun Districts placed under its jurisdiction 1948: Toyotomi village (now town), Teshio District transferred from Rumoi Subprefecture 2010: Horonobe town, Teshio District transferred from Rumoi Subprefecture External links Official website Subprefectures in Hokkaido