The Someș (Romanian pronunciation: [ˈsomeʃ]) or Szamos (German: Somesch or Samosch) is a left tributary of the Tisza in Hungary and Romania.

[8] Someșul Mare has a length of 130 km and an area of 5,033 km2 and a slight asymmetry in favor of the left side of the basin.

[9] For the entire basin of Someș, the asymmetry on left becomes pronounced between Dej and Ardusat to change in the opposite direction after receiving the Lăpuș on the right side.

The valley of Someșul Mare has much auriferous alluvium that, until the early 20th century, were brought to the surface using traditional tools.

In the spring of 1970, due to heavy rains, the Someș flooded part of Satu Mare and surrounding plains.