Otmoor or Ot Moor is an area of wetland and wet grassland in Oxfordshire, England, located halfway between Oxford and Bicester. It is about 60 metres (200 ft) above sea level, and has an area of approximately 160 hectares (400 acres).
Watered by the River Ray, it was until the early 19th century unenclosed marshland, and regularly flooded in winter. An Enclosure Act was passed in 1815, under which the area was extensively drained. This disadvantaged the local farmers and led to civil disturbances known as the Otmoor Riots of 1829–30.
Motorway to nature reserve
The semi-wetland landscape provided habitat for many rare species of birds and butterflies. These were threatened in 1980 by a government proposal for the route of the M40 motorway to cross Otmoor. Opposition to the motorway was led by Friends of the Earth and included the "Alice's Meadow" campaign. The government eventually adopted an alternative route.
Since 1997 a large part of Otmoor has been made an RSPB nature reserve, with large areas of land being returned to marshland.
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