The typifi cation of estuaries and the division of estuary zones of the rivers of Primorsky Territory are considered. Based on the collected data on aquatic biota and the orography of water bodies, three main types of estuaries in Primorye were identifi ed – lowland rivers with an extended estuary zone (Razdolnaya, Tumannaya and Artemovka rivers), mountain rivers with an extended estuarine zone (Kievka, Avvakumovka, Partizanskaya, Milogradovka, Margaritovka and other rivers), mountain rivers with a short estuarine zone (Zerkalnaya, Sukhodol, Barabashevka, Narva, Ryazanovka and other rivers). Characteristics are given on the basis of which the boundaries of estuaries are distinguished. The defi nition of the estuary zone is given.
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