Longis Nature Reserve

View across Longis Bay, Longis Nature ReserveView across Longis Bay, Longis Nature Reserve

A sweeping 105ha coastal reserve including high energy intertidal wetlands, species rich coastal grassland, freshwater wetlands and scrub.

What is the Longis Nature Reserve

The Reserve was designated under a memorandum of understanding in 2003 between the Alderney Wildlife Trust (AWT), the States of Alderney and local landowners. It is the largest terrestrial reserve within Alderney, covering approximately 1/8th of the island.

Walking through the reserve's coastal trails you may glimpse rare plant species such as Small Hare’s-ear, Sand Crocus, Bastard Toadflax and Orange Bird’s-foot, as well as the endemic Alderney Sea Lavender on the rocky shore. Two bird hides overlook the reserve’s freshwater ponds, offering unrivalled views of waterfowl, songbirds and migrants alike.

Longis is the centre of the Alderney Grazing Animals Project (AGAP) with over 20ha managed using a 3-strong herd of Guernsey cattle, who help to maintain the wildflower-rich grassland habitat and support the range of species that depend on it. The coastline itself, with its rocky shoreline and sandy bays, is not only beautiful but rich in marine life.

Longis Nature Reserve Plan


The reserve contains 13 distinct habitats, including marine, intertidal, coastal heathland, grassland, scrub woodland and two freshwater ponds - one natural and one man-made in a disused quarry.

This melange of habitats means a walk through the reserve gives the chance of spotting a huge variety of species.


Longis is home to a wide array of terrestrial and marine species - just a few that might be of interest include:

Water Rail, Little Grebe, Whitethroat, Wheatear, Common Buzzard, Peregrine, Little Egret, Dartford Warbler

European Hedgehog (including the blonde or leucistic form), Greater White-toothed Shrew, Common Pipistrelle, Soprano Pipistrelle

Emperor dragonfly,  Red-veined Darter, Common Blue Damselfly, Black-tailed Skimmer

Thrift Clearwing, Forester, Emperor, Five-spot Burnet moths, Common Blue, Grayling, Glanville Fritillary, Small Copper butterflies

Sand Crocus, Bastard Toadflax, Green-winged and Pyrmidal Orchids, Alderney Sea Lavender (endemic), Pale Flax, Small-flowered Catchfly, Bell Heather and Golden Samphire

Water rail on the bank of Longis pond
Water rail searches the edge of Longis pond for food


Like so much of the island the Longis Reserve is dependent on volunteers and locally raised funds to maintain its facilities. These include:

  • 2 bird hides, including the newly renovated Longis bird hide
  • 3 miles of reserve trail
  • Longis Bay (Alderney's secondary harbour) anchorage and moorings & WC in the Nunnery Car Park



FilenameFile size
Longis nature reserve action plan 20202.82 MB
Longis Reserve review 20192.7 MB
Longis reserve action plan 20191.69 MB
Water rail survey report1.24 MB
Phase 1 surveys 2019863.56 KB
Dragonfly and damselfly survey reports121.73 KB
Reedbed monitoring report 2019146.79 KB
Eelgrass report 2019900.86 KB
Longis reserve management plan 2017-20212.71 MB