What’s the Philadelphi Corridor border zone that Israel wants to control?

Israeli control over the corridor between Gaza and Egypt would mean a de facto full reoccupation of the Gaza Strip. https://www.aljazeera.com/news/2023/12/31/whats-the-philadelphi-corridor-border-zone-that-israel-wants-to-control?traffic_source=rss&feed_id=19026&_unique_id=65918282b215c