Which of the following best defines a natural barrier?

• A. A barrier created by legal statutes
• B. A barrier formed by a river, mountain, or canyon
• C. A barrier implemented through electronic locks
• D. A barrier achieved by social protocols

Answer: (B)

Natural barriers are physical features of the landscape that inherently impede movement or access. A barrier formed by a river, mountain, or canyon fits this description because these geographic features block or slow travel without any human-made controls. This distinguishes it from barriers created by statutes, electronic locks, or social protocols, which rely on laws, technology, or human behavior rather than the terrain itself. In security planning, recognizing natural barriers helps identify choke points and plan routes, responses, and redundancies, while also noting their limitations, such as weather or changes in terrain.