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The Indus River dolphin (Platanista minor) is an endangered freshwater cetacean endemic to the Indus River basin in Pakistan. It is one of the few river dolphin species in the world, adapted to navigating murky, sediment-heavy waters. Because the species is functionally blind, lacking a crystalline...

*Travels on the Amazon* is an 1853 travelogue and natural history book by British naturalist Alfred Russel Wallace. The narrative details his expedition through the Amazon Rainforest and the Rio Negro region of Brazil, which he undertook alongside fellow naturalist Henry Walter Bates between 1848 an...

The Darling River is a major river in eastern Australia and a principal component of the Murray-Darling Basin. It runs for about 1,470 kilometers from the rivers of northern New South Wales to its junction with the Murray River at Wentworth. Its flow is highly variable because rainfall and tributary...

Selys's Sundragon, scientifically known as Helocordulia selysii, is an emerald dragonfly in the family Corduliidae. It is native to North America and belongs to the genus Helocordulia, whose members are commonly called sundragons. The species name honors Edmond de Selys Longchamps, the Belgian zoolo...

The Ruaha River is a major river in Tanzania approximately 950 kilometers long, flowing through the southern highlands before joining the Rufiji River system. It gives its name to Ruaha National Park, one of Tanzania's largest protected areas, which supports significant populations of elephants, lio...

The Jialing River is a major left-bank tributary of the Yangtze River in China, approximately 1,119 kilometers long, flowing through Sichuan Province and the Chongqing municipality. It rises in the Min Mountains of southern Gansu Province and flows generally southward through the Sichuan Basin befor...

The Zeravshan River rises in the Zeravshan Range of the Pamir-Alay mountain system in Tajikistan and flows approximately 877 kilometers westward through Uzbekistan. Historically a tributary of the Amu Darya, the river's water is now fully consumed by irrigation networks before reaching that river. I...

The Aras River, also known as the Araxes, is a transboundary river approximately 1,072 kilometers long that flows through the South Caucasus and northwestern Iran. It forms sections of the international borders between Turkey and Armenia, between the Nakhchivan exclave of Azerbaijan and Iran, and be...

The Sakarya River is a major Turkish river approximately 824 kilometers long, flowing from the Bayat Plateau in central Anatolia westward and then northward to the Black Sea. It is the third-longest river flowing entirely within Turkey and passes through the provinces of Ankara, Eskişehir, and Sakar...

The Saône River is a major navigable river in eastern France approximately 480 kilometers long, flowing southward through the Burgundy and Franche-Comté regions before joining the Rhône River at Lyon. It has served as an important commercial waterway since Roman times, connecting the Paris basin to...

The Havel River is a 334-kilometer river in northeastern Germany that flows through the states of Brandenburg, Berlin, and Saxony-Anhalt before joining the Elbe River at Havelberg. It is navigable for most of its length and forms part of an interconnected inland waterway system linking Berlin to the...

The Ili River is a transboundary river approximately 1,439 kilometers long, rising in the Tian Shan mountains of China's Xinjiang region and flowing westward into Kazakhstan. It is the primary water source for Lake Balkhash, the largest lake in Central Asia, and supports extensive agriculture and we...

The Kabul River is a transboundary river approximately 700 kilometers long, rising in the Hindu Kush mountains of Afghanistan near the city of Kabul. It flows eastward through the Kabul and Jalalabad valleys in Afghanistan before entering Pakistan's Khyber Pakhtunkhwa province and joining the Indus...

The Putumayo River, known as the Içá in Brazil, is a major tributary of the Amazon River approximately 1,813 kilometers long, rising in the Andes mountains of southern Colombia. It forms a substantial portion of the border between Colombia and Peru before entering Brazil, where it joins the Amazon R...

The Rio Grande de Mindanao is the name used for the lower course of the Pulangi River system on Mindanao in the Philippines. The river rises in the island's central highlands, runs through the Cotabato basin, and reaches Illana Bay at or near Cotabato City, where the system divides into distributary...

The Pilcomayo is a river of the Río de la Plata basin whose watershed is shared by Bolivia, Argentina, and Paraguay. It rises in the Bolivian Andes and runs across the Gran Chaco, with parts of its lower course forming or influencing the Argentina-Paraguay boundary before flowing toward the Paraguay...

The Fly River is the third longest river on the island of New Guinea, flowing roughly 1,060 kilometers through Papua New Guinea. It ranks as the largest river in Oceania by water volume, discharging into the Gulf of Papua. The river flows through dense tropical rainforest and features an extensive e...

The Tapajós River is a major tributary of the Amazon River in Brazil, running approximately 1,900 kilometers through the states of Pará and Amazonas. It is known for its clear, dark blue waters and numerous rapids, which limit long-distance navigation. The river flows into the Amazon River near the...

The Ohio River is the largest left-bank tributary of the Mississippi River by water volume, flowing approximately 1,579 kilometers through several states. Historically, it formed the southern boundary of the Northwest Territory in the United States. The river begins at the confluence of the Alleghen...

The Moselle is a 545-kilometer river that flows through France, Luxembourg, and Germany before emptying into the Rhine River at Koblenz. It is well-documented for its steep, terraced vineyards and status as a major wine-producing region, particularly known for Riesling grapes. The river valley has h...

The Chao Phraya River is the major river in Thailand, formed by the confluence of the Ping and Nan rivers and flowing south through Bangkok to the Gulf of Thailand. It is historically notable as the birthplace of the Siamese civilization and served as the center for several historical kingdoms, incl...

The Salween River flows approximately 2,815 kilometers from the Tibetan Plateau through China, Myanmar, and a small section of Thailand. It is recognized as one of Asia's last major undammed rivers for most of its length, sustaining diverse ecosystems and indigenous communities. The river empties in...

The Shire River begins at Lake Malawi and forms its outlet. It flows south through Malawi, passing through Lake Malombe and the Liwonde area, then continues into Mozambique before joining the Zambezi River. The river is about 402 kilometers long and includes upper, middle, and lower sections with di...

The speartooth shark, or Glyphis glyphis, is a rare and elusive requiem shark belonging to the family Carcharhinidae. It is uniquely adapted to survive in the turbid, tropical rivers and estuarine environments of northern Australia and New Guinea. The species exhibits a distinct physiological tolera...

The Argun River, also called Ergune, is a transboundary river of northeastern Asia. Its upper course is known in China as the Hailar River; downstream, the Argun forms about 944 kilometres of the boundary between China and Russia. It then joins the Shilka River at the headwaters of the Amur, linking...

The Cunene River is a major watercourse in Southern Africa that flows for approximately 1,050 kilometers. It originates in the central highlands of Angola and flows southward before turning west to form a significant portion of the border between Angola and Namibia. The river eventually empties into...

The Xiang River is an 856-kilometer watercourse flowing northward through Hunan Province in southeastern China. It is the largest river in the province and a primary tributary to the Yangtze River, emptying into Dongting Lake near the city of Yueyang. Historically, the river is significant as the se...

The Acheloos River is a 220-kilometer watercourse in western Greece and the longest river entirely within the country's borders. Originating in the Pindus mountain range, it flows southward through the Agrafa and Aetolia-Acarnania regions before emptying into the Ionian Sea, forming an extensive del...

The Neman River is a major Eastern European watercourse measuring 937 kilometers in length. It flows westward through Belarus and then north through Lithuania, passing through the country's second-largest city, Kaunas, before reaching the Curonian Lagoon and the Baltic Sea. Historically significant,...

The River Dee is a 137-kilometer watercourse in Scotland that flows eastward from the Cairngorms mountain range toward the North Sea. It passes through the region of Royal Deeside, flowing adjacent to Balmoral Castle, which serves as the British royal family's Scottish residence. The river is ecolog...