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Please see The Oa

Old Hall Marshes

Our reserve here comprises extensive grazing marshes with brackish water fleets, reedbeds, saltmarsh and two offshore islands. In winter, thousands of wildfowl come here and summer sees breeding waders. More...

Old Hall Marshes

Onziebust

Come during the spring and summer and you will see a wonderfully exuberant display of summer flowers and possibly the rare great yellow bumblebee. More...

Onziebust

Oronsay

The whole of the island of Oronsay is designated a Site of Special Scientific Interest (SSSI) and Special Protection Area (SPA) for its chough and corncrake populations. The island is actively farmed by the RSPB to benefit these two species. More...

Oronsay

Otmoor

Otmoor is a magical nature reserve of wet meadows and reedbeds. It is a haven in winter for thousands of ducks, such as teals and wigeons, and in spring and summer for breeding wading birds, such as lapwings and redshanks. More...

Otmoor

Ouse Fen

In the Cambridgeshire Fens we're working with Hanson on an ambitious scheme. We're transforming a working sand and gravel quarry into a vast nature reserve with open water, grassland and, when complete, the biggest reedbed in the UK. More...

Ouse Fen

Ouse Washes

In the heart of The Fens, the Ouse Washes forms the largest area of washland (grazing pasture that floods in the winter) in the UK. The reserve attracts thousands of ducks and swans in winter, and in spring, hundreds of snipe, lapwings and redshanks breed. More...

Ouse Washes