The Siret or Sireth is a river that rises from the Carpathians in the Northern Bukovina region of Ukraine, and flows southward into Romania before it joins the Danube. It is 647 km (402 mi) long, of which a 559 km (347 mi) section is in Romania, and its basin area is 44,811 km2 (17,302 sq mi), of which 42,890 km2 (16,560 sq mi) in Romania. Its average discharge is 250 m3/s (8,800 cu ft/s). In ancient times, it was named Hierasus.

The Moldova is a river in Romania, in the historical region of Moldavia. It is a right tributary of the river Siret. The river rises from the Obcina Feredeu Mountains of Bukovina in Suceava County and joins the Siret in Cotu Vameș, east of the city of Roman in Neamț County. The total length of the Moldova from its source to its confluence with the Siret is 213 km (132 mi). Its basin area is 4,299 km2 (1,660 sq mi).