These go by various names. They are essentially playgrounds with slide, obstacle course, and jungle gym elements. These range from large fort/fortress-type structures to smaller playgrounds for toddlers. Common elements of these structures include shooting fountains, water guns, bridges, slides, water buckets, and ladders/ramps. They are often considered waterparks in miniature.
That is why the play structure is one of the most popular and most widely used areas in aquatic leisure facilities.