Summary: 1. Cross-Disciplinary Connections: Borders Between Land and Sea. – 2. Locating Borders. From international Law to Interdisciplinary Research. – 3. Defining Borders. Between Law, Territories, and Politics. – 4. Borders at the Crossroads: Law, Linguistics, and Cartography. – 5. A Matter of Evolution and Representation. – 6. Crossing Borders: From Interdisciplinary Investigations to the Territorial Constitution … – 7. And Back Again to Cross-Disciplinary Research: Illegal Borders. – 8. Be-bordering Processes: Melting and Walled Borders. – 9. Concluding Remarks. Abstract: The paper engages in a cross-disciplinary examination of the concept of borders. After considering its several connotations in law, geography, and linguistics, it focuses on their interrelations with territory. It then considers how their meaning has evolved over time, thus reflecting the cognitive way whereby political power has tried to superimpose on them its own conception on the world. It then discusses the impact of cross-disciplinary research on comparative-law taxonomies (such as territorial constitution and litigation, territorial demarcation, and alteration), as well of how non-legal variables have some bearing on the operational rule of bordering processes. Keywords: comparative law; cross-disciplinary research; territory; maritime spaces; borders; frontier; boundary.