Ynys-hir RSPB reserve

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Ynys-hir RSPB reserve is a nature reserve of the RSPB situated beside the Dyfi estuary in Ceredigion, mid Wales between Aberystwyth and Machynlleth. The reserve covers 550 hectares and includes a variety of habitats extending inland from mudflats and salt marsh through farmland and pools to oak woodland and hillside scrub. Facilities include a small visitor centre and seven hides.

Ynys-hir [ˈə.nɨ̞s hiːr] means "Long Island" in Welsh. The name refers to a wooded ridge which was once surrounded by marshland.

The area was a private estate until it was bought by the RSPB and became a reserve in 1970.