Sites for National Grid Square: SN

The map below shows sites for this grid square, each represented by a pin that, when clicked, will show the species at that site. The Grid References provided in the table below the map can be used on Ordnance Survey maps, or on a website such as This is currently more accurate than the Google Map rendering you see below (which is up to 200 metres out).

The Grid Square represented by this map is often divided into squares of 10 kilometres each, numbered 0 to 9 from the south west corner, in both an easterly and northerly direction. This allows a Grid Reference such as SU32 to be specified (where SU is the National Grid Square, 3 is the easting and 2 the northing). Further division gives a more detailed reference, such as SU317201 (where SU is the National Grid Square, 317 is the easting and 201 is the northing).


Distribution data (2000-2009) has been made available through the generosity of Butterfly Conservation. Any subspecies distribution is taken from the book British and Irish Butterflies, by Adrian Riley. Based on this data, the following species and subspecies may be found in this grid square:

Species selection:

In the table below, the icon links to a Google search based on the site name, and the and icons (where present) link, respectively, to Google Maps and Streetmap representations of the grid reference.

Site Name Grid Reference Species Subtaxon
Caeau Ffos Fach SN576120 Marsh Fritillary
Coed Allt Fedw SN667729 Grayling ssp. semele
Silver-washed Fritillary
Small Pearl-bordered Fritillary
Cwm Soden SN36605790 Pearl-bordered Fritillary
Gwrelych Valley SN89220634 Common Blue ssp. icarus
Meadow Brown ssp. insularis
Small Blue
Llangrannog SN31505420 Green Hairstreak
Pembrey Country Park SN40500050 Green Hairstreak
Marbled White
Silver-washed Fritillary
Rhos Pilbach SN367528 Marsh Fritillary
Welsh Wildlife Centre SN18304480 Brown Hairstreak
Purple Hairstreak
West Williamston Salt Marshes SN03300580 Brown Hairstreak
Silver-washed Fritillary
Small Tortoiseshell
Ynys-Hir SN683963 Dark Green Fritillary
Pearl-bordered Fritillary
Purple Hairstreak
Silver-washed Fritillary
Small Pearl-bordered Fritillary