Unin ( or Alt-Tonnin) is a village in the administrative district of Gmina Wolin, within Kamień County, West Pomeranian Voivodeship, in north-western Poland. It lies approximately north of Wolin, south-west of Kamień Pomorski, and north of the regional capital Szczecin.
The village has a population of 400.
Notable residents Ernst von Hoeppner (1860–1922), German general
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