Most higher animals are said to be territorial, as a huge amount of work in ethology has made it clear. Human beings are no exceptions. They tend to occupy a certain space around them where they claim their own presence and exclude others quite naturally. If territory is so prevalent among higher animals including humans, then isn't it possible to observe its manifestations in aspects of human language? This book starts from this fundamental question and attempts to demonstrate the key function of the concept of territory in the informational structure and syntax of natural language. It offers an analysis of English, Japanese, and Chinese in terms of territory and shows its fundamental importance in the interface of information and syntax in these languages. Moreover, it argues that the concept of territory plays a major role in the evidentiality of a number of languages and in the linguistic structure of politeness. It also makes much reference to discourse and conversational analysis.