. "The Ob - Irtysh River is 3,364 miles (5,410 km) long. It has an average discharge of 12,800 m\u00B3/s and a drainage area of 2,990,000 km\u00B2. It flows into the Gulf of Ob. The countries within its drainage basin are: Russia, Kazakhstan, P.R. China, Mongolia"@en . "How long is the Ob - Irtysh River"@en . . "The Ob - Irtysh River is 3,364 miles (5,410 km) long. It has an average discharge of 12,800 m\u00B3/s and a drainage area of 2,990,000 km\u00B2. It flows into the Gulf of Ob. The countries within its drainage basin are: Russia, Kazakhstan, P.R. China, Mongolia"@en .