High tide: The Severn Estuary has one of the highest tidal ranges in the world (C Harris)Low tide: As the water drains away it reveals a vast landscape of mudflats and sand banks (C Harris)Yellow flag iris, Parc Tredelerch (C Harris)Magor Mansion, aka The Procurator's House (C Harris)Arrowhead growing in reen (C Harris)Marbled white butterfly (C Harris)East Usk Lighthouse, Newport Wetlands (C Harris)Ruddy darter dragonfly (C Harris)Starling murmuration, Newport Wetlands (C Harris)St Mary's Church, Nash (C Harris)Heron (C Harris)Wales Coast Path (C Harris)St Bridget's Church, St Bridges (C Harris)Common blue butterfly (C Harris)Starling murmuration, Newport Wetlands (C Harris)