The Paraná River is a river in south-central South America, flowing through Brazil, Paraguay, and Argentina for approximately 4,880 km (3,030 miles). Among South American rivers, it is second only to the Amazon in length. The Paraná merges with the Paraguay River and then further downstream merges with the Uruguay River to form the Río de la Plata, which empties into the Atlantic Ocean.

The Irtysh River is a river that flows through Russia, China, and Kazakhstan. It is the main tributary of the Ob River and also the longest river in the world. Notably, it is nearly 600 km (373 mi) longer than the Ob. Its average depth ranges from 6 to 15 meters (20-49 ft).

The Uruguay River is a major river in South America. It flows from north to south and forms part of the border between Brazil, Argentina, and Uruguay, separating several provinces of Mesopotamia in Argentina from the other two countries. Many people, animals, and plants depend on this river for survival, making it a vital waterway for both nature and humanity.

The Iguazu River is a significant waterway in South America. The Iguazu River flows through Brazil and Argentina. It forms part of the boundary between the two countries. The river is approximately 1,320 kilometers (820 miles) long. It originates near the city of Curitiba in the Brazilian state of Paraná and flows westward, eventually joining the Paraná River.

Nile River, the longest river in the world, called the father of African rivers. It rises south of the Equator and flows northward through northeastern Africa to drain into the Mediterranean Sea. It has a length of about 4,132 miles (6,650 kilometres) and drains an area estimated at 1,293,000 square miles (3,349,000 square kilometres).

The Rio Grande, known as the Río Bravo in Mexico, is one of North America's most significant rivers, extending approximately 1,900 miles (3,060 kilometers) from its source in the Rocky Mountains of Colorado to its mouth at the Gulf of Mexico. It serves as a vital water source for millions and forms a natural border between the United States and Mexico, particularly between Texas and several Mexican states including Chihuahua and Coahuila.

The River Rhône is one of the major rivers of Europe. It rises in the Swiss Alps, passes through Lake Geneva and then runs through south eastern France. At Arles, near its mouth on the Mediterranean Sea, the river divides into two branches, known as the Grand Rhône and the Petit Rhône. The resulting delta constitutes the Camargue region.

The Tagus is the longest river in the Iberian Peninsula. The river rises in the Montes Universales between Cuenca and Teruel, in mid-eastern Spain, flows 1,007 km (626 mi), generally westward, and empties into the Atlantic Ocean in Lisbon, right at the point where Portuguese caravels set sail on their many voyages of discovery hundreds of years ago.

The Oder is one of the largest rivers in Central Europe. It rises in the Oder Mountains in the Czech Republic, from where it flows towards the border with Poland. For a short section it is the border river between Poland and the Czech Republic. The longest section is in Poland (503 km). From the confluence of the Lusatian Neisse river to the dividing into Western Oder and Eastern Oder, it marks the border between Germany and Poland (163 km).

The Dnieper River, one of Europe's major rivers, is approximately 2,200 kilometers (1,367 miles) long, making it the fourth longest river in Europe after the Volga, Danube, and Ural rivers. It originates in the Valdai Hills of Russia and flows through Belarus and Ukraine before emptying into the Black Sea. The river's basin covers an area of about 504,000 square kilometers (195,000 square miles).