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).

The Amazon River, located in South America, is renowned for being the largest river by discharge volume of water in the world. It discharges about 215,000–230,000 cubic meters per second, which is approximately 6,591–7,570 cubic kilometers per year. This volume is more than the next seven largest independent rivers combined and accounts for about 20% of the global riverine discharge into oceans.

The Elbe River is one of the major rivers of Central Europe. It rises in the Giant Mountains of the northern Czech Republic before traversing much of Bohemia, then Germany and flowing into the North Sea at Cuxhaven, 110 kilometres (68 miles) northwest of Hamburg. Its total length is 1,094 km (680 mi). The Elbe's major tributaries include the rivers Vltava, Saale, Havel, Mulde, Schwarze Elster, and Ohře.

The Volga is the longest river in Europe and the longest endorheic basin river in the world. Situated in Russia, it flows through Central Russia to Southern Russia and into the Caspian Sea. Exploring the Volga River unveils not only the grandeur of Russia’s longest watercourse (3,531 km or 2,194 mi) and a catchment area of (1,360,000 km2 or 530,000 sq mi) but also the rich biodiversity that thrives in and around its waters.

The Rhine River is one of the longest and most important rivers in Europe. It flows approximately 1,230 kilometers (760 miles) from its source in the Swiss Alps to its mouth at the North Sea in the Netherlands. The Rhine has historically been a vital waterway for trade, cultural exchange, and strategic defense, shaping the economies and histories of the regions it traverses.

The Danube is the second-longest river in Europe, after the Volga in Russia. It flows through Central and Southeastern Europe, from the Black Forest south into the Black Sea, the Danube is the soul of Central Europe. Once a long-standing frontier of the Roman Empire, the Danube is one of Europe’s most famous waterways.