The Săsar (Hungarian: Zazar) is a right tributary of the river Lăpuș in Maramureș County, Romania.^[1][2] It discharges into the Lăpuș in Bozânta Mare, southwest of Baia Mare.^[3] It is a medium-size river which flows through the cities of Baia Sprie and Baia Mare. Its length is 31 km (19 mi) and its basin size is 306 km² (118 sq mi).^[2]

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Săsar
The Săsar flowing through Baia Mare
Location
Country	Romania
Counties	Maramureș County
Villages	Baia Sprie, Tăuții de Sus, Baia Mare, Săsar
Physical characteristics
Source	Mount Arșița
• location	Gutâi Mountains
• coordinates	47°41′28″N 23°48′31″E
• elevation	1,005 m (3,297 ft)
Mouth	Lăpuș
• location	Bozânta Mare
• coordinates	47°37′24″N 23°27′33″E
• elevation	155 m (509 ft)
Length	31 km (19 mi)
Basin size	306 km2 (118 sq mi)
Basin features
Progression	Lăpuș→ Someș→ Tisza→ Danube→ Black Sea
Tributaries
• right	Firiza

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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. The World Health Organization has identified the Baia Mare region as a "health risk hotspot."

The Săsar flows into the Lăpuș, which in turn flows into the Someș, a tributary of the Danube via the Tisza. Pollution in the Săsar thus eventually reaches Romania, Hungary, Serbia, and Bulgaria.