The SomeÃÂ () or Szamos ( or Samosch) is a left tributary of the Tisza in Hungary and Romania. It has a length of (including its source river SomeÃÂul Mare), of which 50 km are in Hungary. The SomeÃÂ 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 SomeÃÂul Mare and SomeÃÂul Mic rivers. SomeÃÂul Mic (formed by the confluence of SomeÃÂul Rece with SomeÃÂul Cald) originates in the Apuseni Mountains, and SomeÃÂul Mare springs from the Rodna Mountains.
SomeÃÂul Mare has a length of 130 km and an area of 5,033 km<sup>2</sup> and a slight asymmetry in favor of the left side of the basin. For the entire basin of SomeÃÂ, the asymmetry on left becomes pronounced between Dej and Ardusat to change in the opposite direction after receiving the LÃÂpuÃÂ on the right side. The valley of SomeÃÂul Mare has much auriferous alluvium that, until the early 20th century, were brought to the surface using traditional tools. Specialists say that in the SomeÃÂul Mare were found grains of gold of 21 carats.
The Someàdrains a basin of , of which in Romania. Its basin comprises 403 rivers with a total length of 5,528 km, or 7% of the total length of the country. Basin area represents 6.6% of the country area and 71% of the area of SomeÃÂâÂÂTisza hydrographic basin.
To prevent flooding, the SomeÃÂ is dammed in the lower course. In the spring of 1970, due to heavy rains, the SomeÃÂ flooded part of Satu Mare and surrounding plains. The discharge exceeded 3,300 m<sup>3</sup>/s compared to that year's average of 210 m<sup>3</sup>/s.
The following rivers are tributaries to the river SomeÃÂ: