This book is a multidisciplinary study of the borderland that intersects the territory of the Polish, Czech, and Slovak languages. Teschen Silesia is a region of transitional language and culture that today is divided between the Czech Republic and Poland. The author examines the complex historical development of this region and describes the diachronic and synchronic development of the traditional dialect. This work explores the complex relation that links language, culture, social networks, and ethnic consciousness in a Slavic borderland.