The Arieș is a left tributary of the river Mureș in Transylvania, Romania. It discharges into the Mureș in Gura Arieșului, 11 km (6.8 mi) southwest of Luduș. Its total length is 166 km (103 mi), and its drainage basin area is 3,005 km2 (1,160 sq mi).
The Abrud is a small river in the Apuseni Mountains, Alba County, western Romania. It is a right tributary of the river Arieș. It flows through the town Abrud, and joins the Arieș in Vârși, near Câmpeni. It is fed by several smaller streams, including Valea Buciumanilor, Valea Cerbului, Corna, Cernița and Roșia Montană. Its length is 24 km (15 mi) and its basin size is 223 km2 (86 sq mi).
The Arieșul Mic is a river in the Apuseni Mountains, Alba County, western Romania. It is the right headwater of the river Arieș. It flows through the villages Avram Iancu and Vidra, and joins the Arieșul Mare in Mihoești near Câmpeni. Its length is 34 km (21 mi) and its basin size is 160 km2 (62 sq mi).
The Iara is a river in the Apuseni Mountains, Cluj County, western Romania. It is a left tributary of the river Arieș. It flows through the villages Valea Ierii, Băișoara and Iara, and joins the Arieș in Buru. Its length is 48 km (30 mi) and its basin size is 321 km2 (124 sq mi).
The Valea Largă is a small river in Cluj County, western Romania. It is a left tributary of the river Arieș. It flows through the municipalities Frata, Ceanu Mare, Tritenii de Jos and Viișoara, and joins the Arieș at Viișoara. It is fed by several smaller streams, including Tritul and Valea Lată. Its length is 24 km (15 mi) and its basin size is 193 km2 (75 sq mi).
The Cheia is a small river in the Apuseni Mountains, Alba County, western Romania. It is a right tributary of the river Arieș. It flows through the villages of Ponor and Vale în Jos, and joins the Arieș near the village Sub Piatră. Its length is 18 km (11 mi) and its basin size is 53 km2 (20 sq mi).
The Valea Racilor is a small river in the Apuseni Mountains, Cluj County, western Romania. It is a left tributary of the river Arieș. It flows through the municipalities Feleacu, Tureni and Turda, and joins the Arieș in the town Turda. It is fed by several smaller streams, including the Fâneața Vacilor. Its length is 25 km (16 mi) and its basin size is 166 km2 (64 sq mi).
The Valea Șesii or Valea Șesei is a right tributary of the river Arieș in Romania. It flows into the Arieș near Baia de Arieș. The Valea Șesii dam is built on this river. Its length is 10 km (6.2 mi) and its basin size is 38 km2 (15 sq mi).
The Ocoliș is a small river in the Apuseni Mountains, Alba County, western Romania. It is a left tributary of the river Arieș. It flows through Ocoliș commune, and joins the Arieș in the village Ocoliș. It is fed by several smaller streams, including Tisa, Pociovaliștea, and Craca. Its length is 14 km (8.7 mi) and its basin size is 67 km2 (26 sq mi).
The Ocolișel is a small river in the Apuseni Mountains, Cluj County, western Romania. It is a left tributary of the river Arieș. It flows through the commune of Iara, and joins the Arieș near the village Lungești. In its upper course it is also called Vad or Valea Vadului. Its length is 25 km (16 mi) and its basin size is 51 km2 (20 sq mi).
The Poșaga is a small river in the Apuseni Mountains, Alba County, western Romania. It is a left tributary of the river Arieș. It flows through the municipality Poșaga, and joins the Arieș near the village Poșaga de Jos. It is fed by several smaller streams, including Incești, Săgagea and Belioara. Its length is 24 km (15 mi) and its basin size is 111 km2 (43 sq mi).
The Hășdate is a small river in the Apuseni Mountains, Cluj County, western Romania. It is a left tributary of the river Arieș. It flows through the municipalities Săvădisla, Ciurila and Petreștii de Jos, and joins the Arieș at Corneşti, near Turda. Its length is 32 km (20 mi) and its basin size is 213 km2 (82 sq mi). It formed the Cheile Turzii, a narrow river gorge.
The Râul Mic is the left headwater of the river Cugir in Romania. At its confluence with the Râul Mare in the town Cugir, the river Cugir is formed. Its length is 28 km (17 mi) and its basin size is 85 km2 (33 sq mi).
The Cioara is a right tributary of the river Arieș in Romania. It discharges into the Arieș in Baia de Arieș. Its length is 9 km (5.6 mi) and its basin size is 26 km2 (10 sq mi).
The Plăiești is a right tributary of the river Arieș in Romania. It discharges into the Arieș near Cornești. Its length is 11 km (6.8 mi) and its basin size is 29 km2 (11 sq mi).
The Pârâul Florilor is a small river in Cluj County, western Romania. It is a left tributary of the river Arieș. It flows through the villages of Boj-Cătun, Valea Florilor and Ploscoș, and joins the Arieș opposite Câmpia Turzii. Its length is 19 km (12 mi) and its basin size is 64 km2 (25 sq mi). A reach of the Câmpia Turzii - Cluj railway follows the course of the Pârâul Florilor.
The Sohodol is a right tributary of the river Arieș in Romania. It discharges into the Arieș in Gura Sohodol. Its length is 10 km (6.2 mi) and its basin size is 41 km2 (16 sq mi).
The Valea Mare is a left tributary of the river Arieș in Romania. It flows into the Arieș in Bistra. Its length is 19 km (12 mi) and its basin size is 69 km2 (27 sq mi).
The Valea Sărată is a left tributary of the river Arieș in Romania. It discharges into the Arieș near Turda. Its length is 8 km (5.0 mi) and its basin size is 22 km2 (8.5 sq mi).
The Văleni is a right tributary of the river Arieș in Romania. It discharges into the Arieș near Moldovenești. Its length is 13 km (8.1 mi) and its basin size is 31 km2 (12 sq mi).
