Bacău County is a county (județ) of Romania, in Western Moldavia, with its capital city at Bacău. It has one commune, Ghimeș-Făget, in Transylvania.
The Ialomița is a river of Southern Romania. It rises from the Bucegi Mountains in the Carpathians. It discharges into the Borcea branch of the Danube in Giurgeni. It is 417 km (259 mi) long, and its basin area is 10,350 km2 (4,000 sq mi). Its average discharge at the mouth is 45 m3/s (1,600 cu ft/s). Ialomița County takes its name from this river.
The Buzău is a river in eastern Romania, tributary of the river Siret. Its total length is 302 km, and its drainage basin area is 5,264 km2. Its source is in the south-eastern Carpathian Mountains, east of Brașov. The Buzău flows through the Romanian counties Brașov, Covasna, Buzău and Brăila. It flows into the Siret in Voinești, close to its confluence with the Danube, west of Galați.
The Trotuș is a river in eastern Romania, a right tributary of the river Siret. It emerges from the Ciuc Mountains in the Eastern Carpathians and joins the Siret in Domnești-Sat near Adjud after passing through Comănești and Onești in Bacău County. The total length of the Trotuș from its source to its confluence with the Siret is 162 km (101 mi). Its basin area is 4,456 km2 (1,720 sq mi).
The Slănic is a left tributary of the river Buzău in Romania. It discharges into the Buzău in Săpoca. Its length is 73 km (45 mi) and its basin size is 580 km2 (220 sq mi). The following villages are situated along the river Slănic, from source to mouth: Terca, Luncile, Lopătari, Săreni, Mânzălești, Beșlii, Sârbești, Vintilă Vodă, Bodinești, Niculești, Podu Muncii, Petrăchești, Dogari, Arbănași, Gura Dimienii, Mărgăriți, Beceni, Valea Părului, Cărpiniștea, Izvoru Dulce, Fulga, Aldeni, Manasia, Căldărușa, Zărneștii de Slănic, Vlădeni, Cernătești and Săpoca.
The Ghimbășel is a left tributary of the river Bârsa in Romania. Its source is in the northern part of the Bucegi Mountains. Originally it discharged directly into the Olt, but much of its flow has been diverted into the Bârsa, another tributary of the Olt, near Colonia Bod. Its length is 67 km (42 mi) and its basin size is 533 km2 (206 sq mi). The former lower course of the Ghimbășel, downstream of this diversion, still exists and is used for the discharge of local inflows. It flows into the Olt north of Bod. Its length is 6 km (3.7 mi) and its basin size is 8 km2 (3.1 sq mi).
The Geoagiu is a right tributary of the river Mureș in Transylvania, Romania. It discharges into the Mureș in Teiuș. Its length is 49 km (30 mi) and its basin size is 187 km2 (72 sq mi).
The Slănic is a right tributary of the Bratia in Romania. It flows into the Bratia in Vlădești. Its length is 17 km (11 mi) and its basin size is 47 km2 (18 sq mi).
The Slănic is a right tributary of the river Trotuș in Romania. It discharges into the Trotuș in Târgu Ocna. Its length is 28 km (17 mi) and its basin size is 126 km2 (49 sq mi).
The Slănic is a left tributary of the river Ialomița in Romania. It discharges into the Ialomița in Comișani. Its length is 30 km (19 mi) and its basin size is 82 km2 (32 sq mi).
The Slănic de Răzvad is a left tributary of the river Ialomița in Romania. It flows into the Ialomița near Nisipurile. Its length is 22 km (14 mi) and its basin size is 47 km2 (18 sq mi).
The Turdaș is a left tributary of the river Mureș in Romania. It discharges into the Mureș in the village Turdaș. Its length is 14 km (8.7 mi) and its basin size is 65 km2 (25 sq mi).
The Peștiș is a left tributary of the river Mureș in Romania. It discharges into the Mureș in Cuiaș. Its length is 9 km (5.6 mi) and its basin size is 34 km2 (13 sq mi).
The Borzontul Mare is a left tributary of the river Mureș in Romania. It discharges into the Mureș near Joseni. The upper reach of the river is also known as Putna. Its length is 15 km (9.3 mi) and its basin size is 46 km2 (18 sq mi).
The Vărbilău is a right tributary of the river Teleajen in Romania. It discharges into the Teleajen in Dumbrăvești. It flows through the villages Târșoreni, Scurtești, Ștefești, Aluniș, Livadea, Vărbilău, Poiana Vărbilău, Coțofenești and Dumbrăvești. Its length is 37 km (23 mi) and its basin size is 217 km2 (84 sq mi).
The Slănic is a left tributary of the river Vărbilău in Romania. It discharges into the Vărbilău in Vărbilău. Its length is 18 km (11 mi) and its basin size is 44 km2 (17 sq mi).
The Jghiab or Jgheab is a left tributary of the river Slănic in Romania. It discharges into the Slănic in Mânzălești. Its length is 13 km (8.1 mi) and its basin size is 51 km2 (20 sq mi).
The Câmpulungeanca is a left tributary of the river Slănic in Romania. It discharges into the Slănic in Dogari. Its length is 10 km (6.2 mi) and its basin size is 18 km2 (6.9 sq mi).
The Pecineaga or Peceneaga is a left tributary of the river Slănic in Romania. It discharges into the Slănic in Vintilă Vodă. Its length is 14 km (8.7 mi) and its basin size is 58 km2 (22 sq mi). The following villages are situated along the river Pecineaga, from source to mouth: Băltăgari, Sările, Sărulești, Cărătnău de Jos and Vintilă Vodă.
The Homocioaia is a left tributary of the river Slănic in Romania. It discharges into the Slănic in Gura Dimienii. Its length is 7 km (4.3 mi) and its basin size is 21 km2 (8.1 sq mi).
