The phrase "natural wonders" refers to the amazing and awe-inspiring sights or phenomena found in nature that are often considered to be of great beauty or significance. These can include things like majestic mountain ranges, stunning waterfalls, vast canyons, breathtaking glaciers, and other natural formations or events that are considered to be truly remarkable. The term is often used to describe places or attractions that are popular tourist destinations due to their unique and captivating natural features.