The Neusiedler See-Seewinkel National Park was founded in 1993. The Fertö-Hanság Nemzeti Park in Hungary was established already in 1991. The protected area now covers about 300km². This National Park is the first cross-border National Park in Austria and the first Austrian National Park that was recognised by the IUCN.

Source: http://www.nationalpark-neusiedlersee-seewinkel.at/en/dernationalpark/eckdaten.html