The River Medina is the main river of the Isle of Wight, England, rising at St Catherine's Down near Blackgang and Chale, and flowing generally northwards through the capital Newport, towards the Solent at Cowes. The river is a navigable tidal estuary from Newport northwards, where it takes the form of a ria .
Its current state has occurred because the Medina used to be a tributary of what was once the "River Solent" and had a much larger catchment area. As the Solent valley flooded and the island eroded, the river received less water flow and more sediment, causing it to become more tidal.
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Isle of Wight