The Someș is a left tributary of the Tisza in Hungary and Romania. It has a length of 415 km (258 mi), of which 50 km are in Hungary. The Someș is the fifth largest river by length and volume in Romania. The hydrographic basin forms by the confluence at Mica, a commune about 4 km upstream of Dej, of Someșul Mare and Someșul Mic rivers. Someșul Mic originates in the Apuseni Mountains, and Someșul Mare springs from the Rodna Mountains.
The Someșul Mic is a river in north-western Romania. At its confluence with the Someșul Mare in Mica, the Someș is formed. Its total length is 178 km (111 mi), and its drainage basin area is 3,773 km2 (1,457 sq mi). It is formed at the confluence of two headwaters, Someșul Cald and Someșul Rece, that originate in the Apuseni Mountains. From the confluence, in Gilău, the Someșul Mic flows east and north through Cluj-Napoca, Apahida and Gherla, until it meets the Someșul Mare in Dej.
The Anieș is a right tributary of the river Someșul Mare in Romania. Upstream from its confluence with the Anieșul Mic, it is also referred to as Anieșul Mare. It discharges into the Someșul Mare in the village Anieș. Its length is 20 km (12 mi) and its basin size is 136 km2 (53 sq mi).
The Someșul Mare is a river in north-western Romania, originating in the Bistrița-Năsăud County in the Rodna Mountains at the confluence of two headwaters — the Preluci and the Zmeu. The Someșul Mare flows west through Rodna, Năsăud and Beclean, until it meets the Someșul Mic at Mica, upstream of Dej. Its length is 130 km (81 mi) and its basin size is 5,033 km2 (1,943 sq mi). Downstream from its confluence with the Someșul Mic, the river is called Someș.
The Ilișua is a right tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Cristeștii Ciceului. Its length is 52 km (32 mi) and its basin size is 353 km2 (136 sq mi).
The Bratoșa is a left tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Florești. Its length is 13 km (8.1 mi) and its basin size is 48 km2 (19 sq mi).
The Măria is a left tributary of the Someșul Mare in Romania. It discharges into the Someșul Mare near Valea Mare. Its length is 12 km (7.5 mi) and its basin size is 48 km2 (19 sq mi).
The Cârțibavul Mare is a left tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Șanț. Its length is 8 km (5.0 mi) and its basin size is 29 km2 (11 sq mi).
The Ilva is a left tributary of the river Someșul Mare in Romania. Its source is near the village Piatra Fântânele and the Tihuța Pass. It flows through the villages Lunca Ilvei, Ilva Mare, Măgura Ilvei and Poiana Ilvei. It discharges into the Someșul Mare in Ilva Mică. Its length is 51 km (32 mi) and its basin size is 419 km2 (162 sq mi).
The Meleș is a left tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Beclean. Its length is 33 km (21 mi) and its basin size is 320 km2 (120 sq mi).
The Valea Mare is a right tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Reteag. Its length is 26 km (16 mi) and its basin size is 155 km2 (60 sq mi).
The Sălăuța is a right tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Salva. Its length is 44 km (27 mi) and its basin size is 413 km2 (159 sq mi).
The Gersa is a right tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Rebrișoara. Its length is 21 km (13 mi) and its basin size is 66 km2 (25 sq mi).
The Runc or Idieș is a right tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Mititei. Its length is 19 km (12 mi) and its basin size is 51 km2 (20 sq mi).
The Rebra is a right tributary of the river Someșul Mare in Romania. Its source is in the Rodna Mountains. It discharges into the Someșul Mare near Rebrișoara. Its length is 44 km (27 mi) and its basin size is 199 km2 (77 sq mi). The upper reach of the river, upstream from the confluence with the Gușatul Mare at Gura Rebra, is also known as Rebrișoara.
The Pârâul Băilor is a right tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Rodna. Its length is 14 km (8.7 mi) and its basin size is 62 km2 (24 sq mi).
The Cormaia is a right tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare 1 km (1 mi) upstream from Sângeorz-Băi. Its length is 21 km (13 mi) and its basin size is 102 km2 (39 sq mi).
The Valea lui Dan is a right tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare near Feldru. Its length is 13 km (8.1 mi) and its basin size is 19 km2 (7.3 sq mi).
The Feldrișel is a right tributary of the river Someșul Mare in Romania. It discharges into the Someșul Mare in Feldru. Its length is 15 km (9.3 mi) and its basin size is 30 km2 (12 sq mi).
The Râșca Mare is a right tributary of the river Someșul Rece in Romania. It discharges into the Someșul Rece downstream from the Cheile de la Arsuri, near Gilău. Its length is 12 km (7.5 mi) and its basin size is 18 km2 (6.9 sq mi).
