The SÃÂsar () is a right tributary of the river LÃÂpuàin MaramureàCounty, Romania. It discharges into the LÃÂpuàin Bozânta Mare, southwest of Baia Mare. It is a medium-size river which flows through the cities of Baia Sprie and Baia Mare. Its length is and its basin size is .
The river was heavily polluted with untreated sewage, agricultural fertilizer, and toxic chemicals from local mining sites, including cyanide, arsenic, lead, and cadmium. One notable incident occurred on 30 January 2000, when a tailings impoundment at the Baia Mare mine burst, releasing 50 to 100 tons of cyanide and heavy metals into the river. The SÃÂsar, locally known as the "dead river," is unsuitable for bathing, washing, or fishing. The World Health Organization has identified the Baia Mare region as a "health risk hotspot."
The SÃÂsar flows into the LÃÂpuÃÂ, which in turn flows into the SomeÃÂ, a tributary of the Danube via the Tisza. Pollution in the SÃÂsar thus eventually reaches Romania, Hungary, Serbia, and Bulgaria.
The following rivers are tributaries to the river SÃÂsar: