Linked from
The 8 pages that link to Ob, each with the reason it gives.
Kara SeaRelated: Its discharge freshens the southern Kara Sea.
NovosibirskRelated: Novosibirsk grew beside the river and its railway crossing.
Gulf of ObRelated: Its freshwater flow and sediment form the estuary at the gulf’s southern end.
SurgutRelated: Surgut stands on its banks, making the river central to the city’s geography.