The Anadyr is long and has a basin of . It is frozen from October to late May and has a maximum flow in June with the
snowmelt. It is navigable in small boats for about to near
Markovo. West of Markovo it is in the
Anadyr Highlands (moderate mountains and valleys with a few trees) and east of Markovo it moves into the
Anadyr Lowlands (very flat treeless
tundra with lakes and bogs). The drop from Markovo to the sea is less than . It rises at about 67°N latitude and 171°E longitude in the Anadyr Highlands, near the headwaters of the
Maly Anyuy, flows southwest receiving the waters of the rivers
Yablon and
Yeropol, turns east around the
Shchuchy Range and passes Markvovo and the old site of
Anadyrsk, turns north and east and receives the
Mayn from the south, thereby encircling the Lebediny
Zakaznik, turns northeast to receive the
Belaya from the north in the
Parapol-Belsky Lowlands, then past
Ust-Belaya it turns southeast into the Anadyr Lowlands past the Ust-Tanyurer Zakaznik and receives the
Tanyurer from the north. At
Lake Krasnoye, it turns east and flows into the
Onemen Bay of the
Anadyr Estuary. If the Onemen Bay is considered part of the river, it also receives the
Velikaya from the south and the
Kanchalan from the north. Other important tributaries are the Yablon, Yeropol and
Mamolina from the right and the
Chineyveyem and
Ubiyenka from the left. Its basin is surrounded by the
Amguema and
Palyavaam basins to the north, the
Bolshoy Anyuy,
Oloy and
Kolyma basins to the northwest, and the
Penzhina basin to the southwest. ==History==