Laja Falls, Waterfall system on Laja River near Los Angeles, Chile.

Laja Falls is a set of four horseshoe-shaped waterfalls on the Laja River, 25 km north of Los Ángeles on the boundary with Cabrero, Biobío Region. The easternmost fall drops 35 m and the western falls 20 m. Below them the river enters a narrow, deep canyon that runs to La Aguada in Yumbel commune.

The falls were first documented in 1756 during Spanish colonial exploration of territories inhabited by Mapuche and Pehuenche peoples. This early record marked an important moment in European mapping of southern Chilean lands.

The falls served as a sacred gathering place where Mapuche elders conducted meditation rituals while young men performed crossing ceremonies as strength tests.

The falls lie beside the old Pan-American Highway, now Route 5, between Los Ángeles and Chillán, about 25 km north of Los Ángeles at the boundary with Cabrero. The four cascades are seen from the roadside; the eastern fall is the tallest at 35 m, the western ones 20 m. Below them the river enters a narrow canyon that runs to La Aguada in Yumbel.

The constant spray from the four cascades creates a natural rainbow effect visible year-round from the observation bridge on sunny days. This optical phenomenon occurs when light passes through the fine water droplets suspended in the air.