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 universe is all of space and time and their contents. It comprises all of existence, any fundamental interaction, physical process and physical constant, and therefore all forms of matter and energy, and the structures they form, from sub-atomic particles to entire galactic filaments.

The Puelo River is a stunning waterway located in the Patagonia region of South America, running through both Chile and Argentina. Known for its turquoise-blue waters, it flows through pristine valleys, snow-capped mountains, and dense forests, making it a favorite destination for nature lovers, anglers, and adventurers.

The Congo River, also known as the Zaire River, is the second-longest river in Africa, after the Nile, and the deepest river in the world, with depths reaching over 220 meters (720 feet). It is approximately 4,700 kilometers (2,920 miles). The river originates in the highlands and mountains of the East African Rift, flowing through the Congo Rainforest. It empties into the Atlantic Ocean. It covers over 4 million square kilometers, spanning multiple countries in Central Africa.

The Mekong River is one of the longest and most important rivers in Southeast Asia, flowing through six countries: China, Myanmar (Burma), Laos, Thailand, Cambodia, and Vietnam. It originates in the Tibetan Plateau of China and travels approximately 4,350 kilometers (2,703 miles) before emptying into the South China Sea.