The Săsar (Hungarian: Zazar) is a right tributary of the river Lăpuș in Maramureș County, Romania.

[2] 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 January 30, 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 Săsar, locally known as the "dead river," is unsuitable for bathing, washing, or fishing.

Pollution in the Săsar thus eventually reaches Romania, Hungary, Serbia, and Bulgaria.