Key Facts

—The warning. Lima’s Chamber of Commerce says the regions most exposed to a strong El Niño hold nearly a quarter of Peru’s economy.

—The regions. Seven northern and coastal departments carry the highest risk, led by Piura and La Libertad.

—The sectors. Fishing has 60% of its output at risk and farming about a third, the group estimates.

—The gap. About S/11.6 billion ($3.4 billion) in prevention works remains unbuilt, the CCL says.