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Ostermark is the Empire's easternmost province and shares its northern border with Kislev. It is a mostly rural state since unlike its neighbours its soil is fertile and ideal for agriculture.
The low tech nature of Ostermark's major industries sometimes leads to its people being mocked in other states as simpletons. This is an unfair reputation however as the people of the Mark are as stout aand capable as those in any other province. For Ostermark regulary sends troops to assist Kislev in its battles against northern invaders. As a result its forces are perhaps the most hardened to war against the forces of Chaos than any others in the Empire.
The Empire collector's guide (Second Edition)