#river basin

• Alazeia — A major river located in northeastern Siberia, within the Sakha Republic (Yakutia), Russian Federation; a watercourse with a length of approximately 1,590 km, which rises from the Alazeia Plateau and structurally flows through the East Siberian Lowland in a catchment basin marked by thousands of lakes, emptying into the East Siberian Sea (Arctic Ocean). This river is characterized by an extreme hydrological regime, remaining frozen from late September until early June, serving as a vital ecological artery for the subarctic tundra and forest-tundra zones.
• Amga River — A major river in Siberia (Russian Federation, Yakutia), the longest left tributary of the Aldan River, within the Lena basin. Its course flows through forested plateaus and deep valleys, featuring a hydrological structure characterized by prolonged freezing during winter and massive discharge in spring.
• Anambra — A federal state located in the southeastern region of Nigeria, with its administrative capital at Awka and its largest commercial and industrial hub in the city of Onitsha. Its name originates from a linguistic corruption of the Oma Mbala (Anam Mbala) river, a major tributary of the Niger River. The region is heavily populated, predominantly inhabited by the Igbo ethnic group, and is internationally recognized for its economic dynamism, vast commercial networks, and agricultural output.
• Argeș — One of the most important rivers in Romania, located in the southern region, springing from the Făgăraș Mountains and flowing into the Danube; also, the name of a county in the historical region of Wallachia, with its administrative seat in the municipality of Pitești. In a structural-geographical sense, the Argeș river basin represents a complex ecosystem and a major economic axis, supplying numerous reservoirs destined for hydroelectric power production, notably Vidraru.
• Argeș natives — Inhabitants or warriors originating from the ancient Daco-Getic region of Argedava or the river basin area of Argeș (Argesis); it can also function as a regional or archaic phonetic variant for the inhabitants of Argeș (argeșeni). In a historical and ethnographic sense, the term describes tribal or medieval communities settled along this major southern hydrographic axis, reflecting regional kinship, traditional costumes, and local dialects.