Ob River, Major Russian Waterway, Length & Tributaries

Chapter 11 Early Exploration and Navigations to the Estuaries of the Ob and the Yenisey in: From Northeast Passage to Northern Sea Route

Ob River Geology Page

Geography of the Soviet Union: Siberian Rivers

Russian Domain: Physical Geography – Siberian Rivers – The Western World: Daily Readings on Geography

Longest Rivers in the World 2023, Top 10 Rivers List

Waterways - Russia and its Empire in Eurasia: Cartographic Resources in the Library of Congress - Research Guides at Library of Congress

What Is The Source Of The Ob River? - WorldAtlas

Kazakhstan's Quest for Arctic Trade Route - WITA

The Ob River watershed with sections

Ob (river) - Wikipedia

Siberian Rivers

The 10 Longest Rivers in the World - Photos and Facts