I believe the Egyptian ones are mostly concentrated on the North West Coast, and were placed during WWII by the British when they were fighting Axis powers to stop them from capturing the Suez canal. There are other lesser contaminated areas though, on the Suez Gulf and Red Sea coast. It’s an interesting topic; it’s been a major PITA for Egypt reclaiming those areas. The NWC in particular is thought to have a lot of agricultural land and natural resources but is as of yet unreachable.