Isles of Scilly - AONB
Hell Bay, Byher

What is the Isles of Scilly AONB?

Simply put, the AONB is an area of land. The land mass of Scilly down to the lowest astronomical tide, to be precise. The Isles of Scilly AONB is the smallest designation in the UK, however the islands possess a diversity of scenery that belies their small scale.

The Isles of Scilly is a group of approximately 200 low-lying granite islands and rocks that cover approximately 1600ha. Their distinctive character is recognised in the designation of the entire islands as a Conservation Area, Area of Outstanding Natural Beauty (AONB) and a Heritage Coast. The islands are also home to RAMSAR (sites are of international importance designated under the Ramsar Convention) and Special Protection Area (SPA) (EU Birds Directive), wetlands sites, 27 Sites of Special Scientific Interest (SSSI), 238 Scheduled Ancient Monuments as well as 130 Listed Buildings.

The islands are also a marine haven for various species and habitats and the encompassing Marine Protected Areas are also designated as a Special Area of Conservation (SAC) (EU Habitats Directive). The areas around the islands are proposed for protection such as Marine Conservation Zones (MCZ).

The islands are encircled by a 50m depth contour which comes to within a few hundred metres of the shore along much of the north, east and south coasts, suggesting a steep slope into deep water at many locations. The Western Rocks, Annet, St. Agnes and the rocks and islands west of Bryher are separated from the rest of the archipelago by depths in excess of 10m. In comparison, St. Mary’s is separated from Bryher, Samson, Tresco and St. Martin’s by depths of less than one metre in places, with extensive tidal flats at low tides joining the latter four islands.

The Isles of Scilly also lie within a European Marine Site (EMS). This site is designated under Article 4(4) of the Directive (92/43/EEC) as it hosts the following habitats listed below:

The chart below shows


IOS Marine Conservation Zone Boundaries PDF




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