Lena Basin  search
BTCommonwealth of Independent States
 .Russian Federation
 ..Lena Basin
BTAsia
 .Lena Basin
UFLena region
 Lena River basin
RTYakutia Russian Federation
 Angara-Lena Basin
 Irkutsk Russian Federation
SNRiver basin. E central and N Siberia including areas in Irkutsk Oblast, and Yakutia. Also search Lena. This term has multiple hierarchies.