The economic growth and development of the urban agglomerations of Bratislava and Győr in recent decades has crossed state borders. It also affects the natural environment on both sides of the border. The neighboring areas of Zitný ostrov (Csallóköz) in Slovakia and Szigetköz (Little Rye Island) in Hungary are of great importance in terms of nature conservation and eco-tourism. Both sides of the border area are rich in natural, cultural and landscape wealth. However, they have not only similar values, but also problems. Some are related to water management and the sustainable use of natural resources, others to the development of cities and municipalities in the suburban area and to the quality of the urban environment.