Short answers, pulled from the story.
The East Siberian Mountains stretch from the Lena River valley to Cape Dezhnyov at the eastern end of the Chukotka Peninsula. This massive system spans nearly 3,000 kilometers across Northeast Siberia and sits between the Central Yakutian Lowland and the Bering Strait.
Winter temperatures can drop below minus 67 degrees Celsius during peak winter months in the Oymyakon Depression. The World Meteorological Organization documents these extreme weather patterns regularly as the area holds the record for world's lowest temperatures in inhabited places.
The Yana River flows northward from the heart of the mountains toward the Arctic Ocean while the Indigirka River carves a path alongside Kolyma which drains the eastern slopes. Anadyr River serves as another major artery draining the northeastern territories and tributary Omolon joins the main flow of Kolyma before reaching the sea.
Over thirty named ranges exist including Angachak Range and Kondakov Plateau. Verkhoyansk Range rises as one of the primary sections while Kharaulakh Range and Kular Range form distinct segments that define the northern boundaries.
Magadan stands as the largest city within the East Siberian Mountains system. Population density remains extremely low across the entire territory according to physical geography studies with most areas remaining uninhabited due to difficult terrain and harsh climate conditions.