Introduction to the Blue Window: The Blue Window (Azure Window) is located on the west side of Gozo Island. It is commonly known as the skylight and is the most famous attraction on the island. The Blue Window was formed by waves eroding limestone over thousands of years. Stone piers about 100 meters in diameter on both sides support a stone cover, thus forming a "window" about 100 meters high and 20 meters wide, from which you can see To the blue waves on the opposite side, the wonderful and spectacular landscape makes people marvel at the uncanny workmanship of nature.