Isles of Scilly - Geography

Geography

The Isles of Scilly form an archipelago of five inhabited islands and numerous other small rocky islets (around 140 in total) lying 45 km (28 mi) off Land's End. They are all composed of granite rock of early Permian age, an exposed part of the Cornubian batholith.

The islands' position produces a place of great contrast—the ameliorating effect of the sea, greatly influenced by the North Atlantic Current, means they rarely have frost or snow, which allows local farmers to grow flowers well ahead of those in mainland Britain. The chief agricultural product is cut flowers, mostly daffodils. Exposure to Atlantic winds also means that spectacular winter gales lash the islands from time to time. This is reflected in the landscape, most clearly seen on Tresco where the lush sub-tropical Abbey Gardens on the sheltered southern end of the island contrast with the low heather and bare rock sculpted by the wind on the exposed northern end.

As part of a 2002 marketing campaign, the plant conservation charity Plantlife chose sea thrift (Armeria maritima) as the "county flower" of the islands.

This table provides an overview of the most important islands:

(1) Inhabited until 1855.

In 1975 the islands were designated as an Area of Outstanding Natural Beauty. The designation covers the entire archipelago, including the uninhabited islands and rocks, and is the smallest such area in the UK. The islands of Annet and Samson have large terneries and the islands are well populated by seals. The Isles of Scilly are the only British haunt of the Lesser White-toothed Shrew (Crocidura suaveolens).

The islands are famous amongst birdwatchers for their ability to attract rare birds from all corners of the globe. The peak time of year for this is generally in October when it is not unusual for several of the rarest birds in Europe to share this archipelago. One reason for the success of these islands in producing rarities is the extensive coverage these islands get from birdwatchers, but archipelagos are often favoured by rare birds which like to make landfall and eat there before continuing their journeys and often arrive on far flung islands first.