Why physical barrier is the most difficult yo overcome?

Physical barriers are often the most difficult to overcome because they present tangible obstacles that cannot be easily bypassed or altered. These barriers, such as mountains, rivers, or walls, require significant resources, effort, and time to navigate or remove. Additionally, they can isolate communities, limit access to resources, and hinder communication, making collaboration and problem-solving more challenging. As a result, addressing physical barriers often necessitates comprehensive planning and sustained commitment.