Porto Istana is a beautiful beach located in the northeastern part of Sardinia, Italy. It is known for its crystal-clear turquoise waters and white sandy beach, which stretches for over a kilometer. The beach is backed by a pine forest, providing a beautiful natural setting. It is a popular spot for swimming, sunbathing, snorkeling, and other water sports. There are also several restaurants and bars nearby, making it a great place to relax and enjoy the beautiful scenery.