The Aldan River is the second-longest tributary of the Lena River in eastern Siberia. The river is 2,273 km long, of which around 1,600 km is navigable. A tributary (or affluent or confluent) is a contributory stream, a river that does not reach the sea, but joins another major river (a parent river), to which it contributes its waters, swelling its discharge. ... The Lena River (Russian: Ле́на) in Siberia is the 10th longest river in the world and has the 9th largest watershed. ... Siberia Siberia (Russian: , common English transliterations: Sibir’, Sibir; from the Tatar for “sleeping land”) is a vast region of Russia and northern Kazakhstan constituting almost all of northern Asia. ... The Murray River in Australia. ...

It rises in the Stanovoy Mountains south west of Neryungri, then north east past Aldan and through Tommot, Ust'-Maya, El'dikan and Khandyga before turning north west and joining the Lena near Batamay. The Stanovoi Range (Russian: Станово́й хребе́т), also spelled as Stanovoy Range, is a mountain range located in southeastern parts of the Russian Far East. ...

The river's main tributaries are the River Amga, River Uchur and River Maya. Its basin is known for gold and for Cambrian fossils. Basin has several meanings: Look up basin in Wiktionary, the free dictionary. ... General Name, Symbol, Number gold, Au, 79 Chemical series transition metals Group, Period, Block 11, 6, d Appearance metallic yellow Atomic mass 196. ... The Cambrian is a major division of the geologic timescale that begins about 542 million years before the present (BP) at the end of the Proterozoic eon and ended about 490 million years BP with the beginning of the Ordovician period. ... A fossil Ammonite Fossils are the mineralized remains of animals or plants or other traces such as footprints. ...