Qashliq, Isker or Sibir (Tatar language: Qaşlıq or İskär) was a medieval (14th-16th century) Siberian Tatar fortress, in the 16th century the capital of the Khanate of Sibir, located on the right bank of the Irtysh River at its confluence with the Sibirka rivulet, some 17 km from the modern city of Tobolsk. The fortress is first mentioned in Russian sources of the 14th century.
The period of the most development was in the first half of the 16th century. In 1582 the troops of Cossack ataman Yermak seized and ruined Qashliq. The ruined city was retaken by the Tatars in 1584 only to be lost forever in 1586. The nearby city of Tobolsk was founded in 1587. The former Sibirka rivulet today is reduced to a dense swampy forest. The name Sibirka was probably named from the name of the fortress (and not vice versa), the name Sibir meaning literally "sleeping land" (from Sib Ir  itself the source of the name of Siberia where it may have been an alternative name for the Ugrian-speaking Mansi/Vogul and which David Christian has linked with the far Eastern Hsien-pi". Sources differ on the exact location of the fortress. Most give the distance upriver from Tobolsk as 17 or 18 km, or versts, or ten to eleven miles, but others give 23 km. Sources of the early 19th century claim that the ruins of the fortress could still be made out with difficulty. The ruins of Qashliq, when they were still visible, were also referred to as The Fort of Kuchum by Russians. The modern village of Sibiryak (поселок Сибиряк) is located close to the site. Coordinates:
- Shown about four degrees of longitude due east of Perm. Mercator is also mistaken about hydrology, placing Perm in the Ob basin and depicting the Irtysh as flowing southward. He is using a prime meridian at about 25° W, so that Sibir ends up at close to 100° E.
- Istoriia Sibiri s drevneishikh vremem do nashikh dnei, Leningrad, 1968, cited after The Great Soviet Encyclopedia, 3rd Edition (1970-1979).
- Trans-Siberian for softies | Travel | The Observer
- Christian, David. A History of Russia, Central Asia and Mongolia. Blackwell Publishing, 1998. Page 279.
- e.g. J. Bell, A system of geography, popular and scientific, 1832, p. 70. T. Curtis, The London encyclopedia, 1829, p. 288
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