Moika in May

The Moyka River (Russian: Мойка) is a small river in Russia that encircles the central portion of Saint Petersburg, effectively making it an island. The river, originally known as Mya, derives its name from the Ingrian word for "slush" or "mire". It is 5 kilometres (3 mi) long and 40 metres (130 ft) wide.

The river flows from the Fontanka River near the Summer Garden past the Field of Mars, crosses Nevsky Avenue and the Kryukov Canal before entering the Neva River delta. It is also connected with the Neva by the Swan Channel and the Winter Channel.