Horsey Mere is part of Upper Thurne Broads and Marshes, a Site of Special Scientific Interest.

The mere is owned by the National Trust, as is Horsey Windpump.

The volume of water held in the mere is approximately 491,313 cubic metres (17,350,600 cu ft).

[2][3] A regatta open to all broads craft is held on the mere each summer.

[4] There are various informal race fixtures, all are open to private and hire craft.