In the lower part of its run, it forms the country borders between the Czech Republic and Slovakia, and also Austria and Slovakia. Its mouth is situated about 10 km upstream Bratislava. The 80-km long section of the Morava River forms the Austrian-Slovak border, and from the confluence with the Dyjc River, the Slovak-Czcch State border, while the River Dyjc - a tributary to Morava River — forms the border between Austria and the Czech Republic.