The area of the national park is a meeting point for different plant and animal species. These include alpine, pannonian, asian, mediterranean and northern European species. This results in a mosaic of environments, including wetlands, herding meadows, meadows, sand steppes and salt areas. In the west the area is bordered by the Leitha Mountains, the Parndorf Plain in the north and the Hanság in the east. The mire of Hanság was for centuries a part of Lake Neusiedl. Lake Neusiedl itself is situated at the lowest point of the Little Hungarian Plain at an altitude of around 115m above sea level.