4,000-yr-old network of canals found in Belize

LONG before the ancient Maya built temples, their predecessors were already altering the landscape of Central America's Yucatan peninsula.

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Using drones and Google Earth imagery, archaeologists have discovered a 4,000-year-old network of earthen canals in what's now Belize. The findings were published on Friday in Science Advances.

"The aerial imagery was crucial to identify this really distinctive pattern of zigzag linear canals," running for several miles through wetlands, said study co-author Eleanor Harrison-Buck of the University of New Hampshire.