The Sechín River is a seasonal river about 55 km (34 miles) long in the Ancash department of Peru that remains dry for long seasons, increasing its volume at times of rain in the mountains at its source.
[2] It rises at an altitude of 4,385 m (14,386 ft) in the Cordillera Negra and it ends by flowing into the Casma River about 10 km (6.2 miles) inland from the Pacific Ocean.
The Casma-Sechin basin runs down the western slopes of the Andes mountain range - one of the world’s driest deserts.
Historical records showed that the Sechín was severely affected by flooding in 1925 from an extremely strong El Niño cycle.
The Casma-Sechin culture is one of the oldest civilizations in the Americas with monumental architecture dating back to 3600 BCE.