How did the Shephelah region function in biblical times to protect the area of Judah?

In biblical times, the Shephelah region served as a vital buffer zone for the Kingdom of Judah, strategically situated between the coastal plain and the mountainous interior. Its rolling hills and valleys provided natural defenses and vantage points, making it difficult for invading forces to penetrate deeper into Judah. The region was also dotted with fortified cities that acted as watchtowers and strongholds, allowing for early warning and response to potential threats. Additionally, the agricultural productivity of the Shephelah supported the population and military needs of Judah, further enhancing its security.