The lazy river at Siam Park in Tenerife, known as the Mai Thai River, is approximately 1 kilometer (about 3,280 feet) long, making it one of the longest and most diverse lazy rivers in the world. What sets it apart is that it features both "slow" and "fast" sections, including a unique lift system that carries guests up to a higher elevation so they can float through a lush, tropical jungle canopy. One of the most thrilling parts of the Mai Thai River is a glass tunnel section that passes directly through a giant aquarium filled with sharks and rays, offering a spectacular view from your inner tube. A full circuit of the river takes roughly 15 to 20 minutes depending on the current and how much you linger in the "relax" zones. The water is heated to a comfortable 24°C (75°F) year-round. It is widely considered a "must-do" at the park, providing a perfect way to dry off and see the incredible Thai-themed architecture of the park without having to climb the stairs for the more intense slides.