The Ainu are the indigenous people of the lands surrounding the Sea of Okhotsk, including Hokkaido Island, Northeast Honshu Island, Sakhalin Island, the Kuril Islands, the Kamchatka Peninsula and Khabarovsk Krai, before the arrival of the Yamato Japanese and Russians. These regions are referred to as in historical Japanese texts. Official estimates place the total Ainu population of Japan at 25,000. Unofficial estimates place the total population at 200,000 or higher, as the near-total assimilation of the Ainu into Japanese society has resulted in many individuals of Ainu descent having no knowledge of their ancestry. , the number of "pure" Ainu was estimated at about 300 people. In 1966, there were about 300 native Ainu speakers; in 2008, however, there were about 100. Names This people's most widely known ethnonym, "Ainu" (; ; ) means "human" in the Ainu language, particularly as opposed to , divine beings. Ainu also identify themselves as "Utari" ("comrade" or "people"). Official documents use both names. History Pre-modern The Ainu are the native people of Hokkaido, Sakhalin and the Kurils. Early Ainu-speaking groups (mostly hunters and fishermen) migrated also into the Kamchatka Peninsula and into Honshu, where their descendants are today known as the Matagi hunters, who still use a large amount of Ainu vocabulary in their dialect. Other evidence for Ainu-speaking hunters and fishermen migrating down from Northern Hokkaido into Honshu is through the Ainu toponyms which are found in several places of northern Honshu, mostly among the western coast and the Tōhoku region. Evidence for Ainu speakers in the Amur region is found through Ainu loanwords in the Uilta and Ulch people. Research suggests that Ainu culture originated from a merger of the Okhotsk and Satsumon cultures. According to Lee and Hasegawa, the Ainu-speakers descend from the Okhotsk people who rapidly expanded from northern Hokkaido into the Kurils and Honshu. These early inhabitants did not speak the Japanese language; some were conquered by the Japanese early in the 9th century. In 1264, the Ainu invaded the land of the Nivkh people. The Ainu also started an expedition into the Amur region, which was then controlled by the Yuan Dynasty, resulting in reprisals by the Mongols who invaded Sakhalin. Active contact between the Wa-jin (the ethnically Japanese, also known as Yamato-jin) and the Ainu of Ezogashima (now known as Hokkaidō) began in the 13th century. The Ainu formed a society of hunter-gatherers, surviving mainly