The Hertsa or Hertza (Romanian: Herța; Ukrainian: Герца) is a right tributary of the river Prut in Romania and Ukraine.

[1][2] It flows through the town Hertsa, and discharges into the Prut near Marshyntsi.

In Romania, its length is 6 km (3.7 mi) and its basin size is 23 km2 (8.9 sq mi).

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