Serbia is home to several important river systems, with the most significant being the Danube, Sava, and Morava rivers. The Danube is the second-longest river in Europe and forms part of Serbia's northern border. The Sava flows through the capital city, Belgrade, and is a major tributary of the Danube. The Morava River system, consisting of the West Morava and South Morava, is crucial for the country's drainage and agriculture. These rivers support diverse ecosystems and provide water for irrigation, transportation, and hydroelectric power, playing a vital role in Serbia's economy and environment.