Canterbury City Council has issued a public safety warning after the discovery of a deadly algae at Stodmarsh Nature Reserve.
It follows testing by the Environment Agency which found the blue-green vegetation in the reserve, which lies in the valley of the Great Stour river between Westbere and Grove Ferry.
A council spokesman said: “The algae can cause illness in humans and can be fatal to animals. Keep yourselves and pets safe by avoiding the water until further notice.”
The reserve is famous for attracting rare and endangered bird species as well as otters and water voles.