Someș

The Someș is a left tributary of the Tisza in Hungary, located in northern Romania. It stretches for 415 kilometers (258 miles) (including the source river Someșul Mare), 50 kilometers of which are in Hungary. The Someș is Romania's fifth-longest and most-debtuous river. The junction of the Someșul Mare and Someșul Mic rivers at Mica, a commune about 4 km upstream of Dej, defines the hydrographic basin. The Apuseni Mountains give rise to Someșul Mic (created by the confluence of Someșul Rece and Someșul Cald), while the Rodna Mountains give rise to Someșul Mare. Someșul Mare is 130 kilometers long and 5,033 kilometers wide, with a small asymmetry in favor of the left side of the basin.

Between Dej and Ardusat, the asymmetry on the left gets more extreme, changing in the other way after getting the Lăpuș River on the right side. The auriferous alluvium in the Someșul Mare valley was brought to the surface using traditional methods until the early twentieth century. According to experts, gold grains weighing 21 carats were discovered in the Someșul Mare.

The Someș is dammed in the lower course to prevent flooding. The Someș flooded part of Satu Mare and the neighboring plains in the spring of 1970 due to torrential rains. In comparison to the year's average of 210 m3/s, the debit exceeded 3,300 m3/s.

Leghth: 376 km