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Nonfiction Arbitrary lines in the sand PRISONERS OF GEOGRAPHY: Ten Maps that Explain Everything About the World By Tim Marshall 305 pp. Scribner Reviewed by Marty Carlock Prisoners of Geography is a brief and opinionated course in geopolitics. Filled as it is with an intimidating amount of information, the fact that it finds itself on the best-seller list may have a lot to do with its clever title. Yet author Tim Marshall makes a case for his theme: that the geographical limitations of each nation and/or continent dictate its ambitions, its achievements, even its wealth.  How does Marshall know so much about everything in the world? As a foreign correspondent for British television, he has reported from 30 countries, including six war zones. His expertise extends across four continents, omitting Antarctica because of the Antarctic Treaty, which declares it an international scientific preserve where military activity is banned. (He omits Australia, too.) However, he analyzes the ne...