VICTORIA, AU – Extensive water channels built by indigenous Australians thousands of years ago to trap and harvest eels for food have been revealed after wildfires burned away thick vegetation in the state of Victoria, CNN reported.

This ancient aquatic system is older than the pyramids, constructed by the Gunditjmara people more than 6,600 years ago.

The system consists of channels, weirs and dams built from volcanic rocks, is one of the world’s most extensive and oldest aquaculture systems, according to UNESCO.

The system was known to archaeologists and was added to UNESCO’s World Heritage List last July, but additional sections have been revealed by the fires that have blazed through the state in December.