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Črnec is a river in Croatia, a tributary of the Lonja-Strug canal, monitored by the government as it is longer than 20km (10miles).[1]
It rises at the southern slopes of the Medvednica near, and flows towards the southeast, passing through the eponymous village of . Afterwards its flow has been modified by humans and it reaches the Lonja near Posavski Bregi through the canal that connects it with the Sava.