The Nuttall Encyclopedia
A river and, with its tributaries, great water highway of West Siberia, which rises in the Altai Mountains, and after a course of 2120 m. falls into the Arctic Ocean.
Wood, James, ed. Entry for 'Obi'. The Nuttall Encyclopedia. https://www.studylight.org/encyclopedias/eng/nut/o/obi.html. Frederick Warne & Co Ltd. London. 1900.