Thornbury's medieval fishponds have been given special status protecting them from development.
The decision by English Heritage to schedule the fishponds under the Ancient Monuments and Archaeological Areas Act 1979 has been welcomed by residents and the local planning authority, which was behind the application.
A spokesman for South Gloucestershire Council said: "The council is responsible for the request to English Heritage to schedule the fishponds as a monument and we are pleased that their significance is recognised."
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