This is where the estuary channel splits at the downstream end of Alney Island, which is just downstream of Gloucester. The island is a nature reserve and Lower Parting is a great place to see estuary bird life, and also to watch the Severn Bore. Here there is little inter-tidal area in the channel but the river level still rises and falls with the tide.
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Jump to the place marker on the SES map here
The Severn Estuary Survey (SES) 