GCC countries are looking at introducing a unified single visa
 

The Gulf Cooperation Council (GCC) countries — Bahrain, Kuwait, Oman, Qatar, Saudi Arabia, and the United Arab Emirates — are looking to launch a ‘Schengen-style” visa for tourists.

Khaleej Times »

“We see that happening very soon because we see people flying from abroad to Europe usually spending their time in several countries rather than in one country. We really saw the value this can bring not to each country but all of us,” Al Sairafi said during a panel discussion on “The Future of Travel for the GCC”, held at the Arabian Travel Market in Dubai.

#YMMV A development to keep an eye on if you plan to visit those countries.