UN member states are not required to recognize each other. Israel was accepted as sovereign & its borders on file for all nations to know. Also known are the actual borders of Palestine, though at the time it was a 'non-state entity'; now it is a non-sovereign State. The borders of Palestine are known to all, Israel just chooses to ignore them and pretend that Palestine doesn't exist and continues to violate international & humanitarian law, laws of war & many UNSC resolutions.
Lebanese protesters storm environment ministry amid trash crisis (AP)