Noah's Ark (officially Noah's Ark Family Park Inc.) is the largest outdoor water park in the United States. It features 51 water slides and dozens of various attractions. The park is located in the village of Lake Delton, Wisconsin.

In 2026, Noah’s Ark Waterpark in Wisconsin Dells remains the largest outdoor water park in America by both acreage and attraction count. Spanning over 70 acres, the park features 51 water slides and dozens of other attractions, including two giant wave pools and a unique "figure-eight" lazy river. Notable record-breaking slides include the "Scorpion’s Tail" (the first near-vertical looping body slide in the U.S.) and the "Point of No Return" (a 10-story speed slide). For those looking for the largest indoor water park, the title belongs to DreamWorks Water Park at the American Dream mall in New Jersey, which offers a climate-controlled 8.5-acre environment with the world's tallest indoor body slide. While parks like Schlitterbahn in Texas are famous for their innovative "uphill" water coasters and natural spring-fed sections, Noah’s Ark continues to hold the official crown for sheer scale and variety, cementing its home of Wisconsin Dells as the "Waterpark Capital of the World."