Dagály Beach and Swimming Pool was opened in 1948 in a scenic environment at northern Budapest, on the banks of the river Danube. Thermal waters found under the bed of Danube previously wastefully flowing into the river were utilised at its opening in 1948. The water comes from a depth of
126 m, delivering thermal water of 41,5 C. Since 1970 when the medical waters of Széchenyi spa and swimming pool were piped to Dagály, it functions as one of the medical baths of Budapest.
Next to Dagály Spa locates Danube Arena, an aquatics complex. It was planned by Marcell Ferenc and built between 2015 and 2017. The facility has two full course swimming pools, a diving pool and a short course training pool. The venue had been planned to be the home of the World Aquatics Championships in 2021 but after the original host of the 2017 venue, Guadalajara withdrew in February 2015, it was announced that Budapest would host the 2017 FINA Championships. The venue has 5000 seats, with an additional 8000 temporary seats.