This marsh on Jurassic clay is in the valley of the River Smite, which runs through the site. There are also areas of grassland, bracken and woodland, and the diverse habitats support a range of birds and insects.[4]
^"Map of Holwell Mouth". Sites of Special Scientific Interest. Natural England. Retrieved 13 November 2017.
^"Holwell Mouth". Common Land in England. Retrieved 13 November 2017.
^"Holwell Mouth citation"(PDF). Sites of Special Scientific Interest. Natural England. Archived from the original(PDF) on 3 March 2016. Retrieved 13 November 2017.
Wikimedia Commons has media related to Holwell Mouth.