Displaced Lebanese cannot return to southern Lebanon because of Israel's documented use of white phosphorus in the villages of Nabatieh, Tyre, Khiam, and Yohmor. With fresh evacuation orders and over 1 million people displaced, residents of southern Lebanon have nowhere to go.
There are so many sources citing different figures, I just picked the one that is mostly used by media. Also, it is believed that the figures in Gaza are much higher than the figures that the data shows. But without proof, I didn’t/couldn’t link it.