Saywa Q'asa (Quechua saywa boundary stone, landmark, q'asa mountain pass,[2] "landmark mountain pass", Hispanicized spelling Sayhuaccasa) is a mountain in the Andes of Peru, about 5,000 metres (16,404 ft) high.

It is situated in the Ayacucho Region, Cangallo Province, in the north of the Paras District.

The Pampawasi River (Pampahuasi) originates near Saywa Q'asa.

It flows to the south where its waters reach Pampas River near the town of Paras.

This Ayacucho Region geography article is a stub.