RSPB Belfast Lough reserve is situated within the Belfast Harbour Estate on the shores of Belfast Lough. The RSPB manages some mudflats in Belfast Lough, together with an area of grassland with a pool and ditch complex near Belfast City Airport, and a lagoon with a hide and viewpoints.

The mudflats are important feeding areas for a variety of wading birds and wildfowl. At high tide, flocks of wading birds, such as redshanks, oystercatchers and black-tailed godwits, can be seen from the hide and viewing points.