Sechura Desert

The Sechura Desert runs along Peru’s northern Pacific coast, starting south of the Piura Region and stretching inland to the lower slopes of the Andes. Its dryness comes from cold coastal waters rising to the surface and sinking subtropical air, yet heavy rains during El Niño years can cause sudden flooding. The desert holds the Bayóvar Depression, the lowest point in both Peru and the entire Southern Tropics.

This desert forms a narrow strip through southern Piura and western Lambayeque, reaching from the shore to the Andes’ secondary ridges. Near the city of Piura, it gives way to the Tumbes–Piura dry forests, an equatorial dry forest habitat that covers much of eastern Lambayeque. Short rivers flowing from the Andes cross the desert, supporting intensive farming on fertile bottomlands. Two of Peru’s five largest cities, Piura and Chiclayo, lie within this agricultural zone in the north.

Despite its aridity, the Sechura has seen flooding from rivers and Pacific storms. In 1728, an earthquake-generated tsunami swept inland, destroying the original town of Sechura, which was then closer to the coast. Survivors moved inland and rebuilt it where it stands today. During El Niño years, flooding is common. In 1998, runoff from swollen rivers poured into the desert, creating a temporary lake that filled the Bayóvar Depression. Where there had been barren, hard ground for 15 years, the second-largest lake in Peru suddenly appeared, with dry sand and clay domes rising from its surface.

The Pacific Ocean moderates temperatures, keeping the range narrow. Summer (December to March) is warm and sunny, with daytime highs above a certain mark and nights averaging above another. Winter (June to September) is cool and cloudy, with temperatures varying from a low at night to a high during the day. The desert is among the most arid on Earth due to the cold coastal upwelling and subtropical air subsidence.

The Bayóvar Depression marks the desert’s lowest point. Short rivers crossing the area supported prehistoric indigenous settlements for thousands of years. Urban cultures like the Moche thrived here, eating fish, guinea pigs, camelids, squash, and peanuts. The Sican Culture (around 800–1300 CE) followed the Moche, developing advanced lost-wax goldsmithing. Today, the same rivers sustain irrigated agriculture on the fertile lowlands.