The Aubad is a 50000m2 man-made lake in Tulln on the Danube, Austria. It is the centerpiece of a recreational park (Erholungspark) that includes facilities for swimming, as well as a 10ha area for sport and leisure activities—such as soccer, volleyball, baseball and basketball—and 15ha of woodland. The lake and park are popular summertime resorts for both townspeople and tourists.