The Anadyr is a river in the far northeast of Siberia which flows into the Gulf of Anadyr of the Bering Sea and drains much of the interior of Chukotka Autonomous Okrug. Its basin corresponds to the Anadyrsky District of Chukotka.

Chukotka, officially the Chukotka Autonomous Okrug, is the easternmost federal subject of Russia. It is an autonomous okrug situated in the Russian Far East, and shares a border with the Republic of Sakha to the west, Magadan Oblast to the south-west, and Kamchatka Krai to the south, as well as a maritime border on the Bering Strait with the U.S. state of Alaska to the east. Anadyr is the largest town and the capital, and the easternmost settlement to have town status in Russia.