A Level 2 designation advises Japanese citizens to limit travel to these nations and the remaining Gulf Cooperation Council (GCC) member states to essential purposes only, while refraining from all non-essential travel.

GCC - is a regional, intergovernmental, political, economic union, and military alliance comprising Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the United Arab Emirates.^[3][4]

I had no clue what GCC was