The Bolshaya Ussurka (, literally: "Great Ussuri") is a river in the Russian Far East in Primorsky Krai. It is a right tributary of the Ussuri, which it meets near Dalnerechensk, some 357 km from the mouth of the Ussuri.

The area of the Bolshaya Ussurka drainage basin is approximately . It is long. The river was known as "Iman" (Иман) until the 1972 Renaming of geographical sites in the Russian Far East.Переименована Указом Президиума Верховного Совета РСФСР от 26 декабря 1972 г. и Постановлением Совета Министров РСФСР № 753 от 29 декабря 1972 г. (Renamed by the Decree of the Presidium of the Supreme Soviet of the RSFSR of December 26, 1972 and the Resolution of the Council of Ministers of the RSFSR No. 753 of December 29, 1972.)

The major tributaries of the Bolshaya Ussurka are the rivers Malinovka, Marevka, Naumovka and Armu.

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