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The Aldan (Russian: Алдан) is the second-longest, right tributary of the Lena in the Sakha Republic in eastern Siberia. The river is 2,273 kilometres (1,412 mi) long, of which around 1,600 kilometres (990 mi) is navigable. It has a drainage basin of 729,000 square kilometres (281,000 sq mi). It was part of the River Route to Okhotsk. In 1639 Ivan Moskvitin ascended the rivers Aldan and Maya and crossed to the Ulya to reach the Sea of Okhotsk.
|• location||Stanovoy Mountains|
|Length||2,273 km (1,412 mi)|
|Basin size||729,000 km2 (281,000 sq mi)|
|• average||5,060 m3/s (179,000 cu ft/s)|
|Progression||Lena→ Laptev Sea|
|• left||Amedichi, Amga|
|• right||Timpton, Uchur, Maya, Allakh-Yun|
It rises in the Stanovoy Mountains southwest of Neryungri, then flows northeast across the Aldan Highlands past Aldan and through Tommot, Ust-Maya, Eldikan and Khandyga before turning northwest and joining the Lena near Batamay.