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The Ob zigzags west and north until it reaches 55° N, where it curves round to the northwest, and again north, wheeling finally eastwards into the Gulf of Ob, a deep (600 mi.) bay of the Kara Sea of the Arctic Ocean.
From the river-head of Irtysh to the mouth of Ob, the Ob-Irtysh river flow is the longest in Russia at 5410 km.
The Ob is ice-bound at southern Barnaul from early in November to near the end of April, and at nothern Salekhard, 100 mi above its mouth, from the end of October to the beginning of June.
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