4f4c4942-4343-5764-6473-313631333439 English NRW_DS46160 Natural Resources Wales Maes y Ffynnon Bangor LL57 2DW Wales opendata@cyfoethnaturiolcymru.gov.uk 2026-04-22T15:21:56.26Z NRW 1.0 wel British National Grid (EPSG:27700) Gweunydd Nant y Twyn SSSI - National Vegetation Classification (NVC) Grassland Survey (2024) Gweunydd Nant y Twyn SSSI - National Vegetation Classification (NVC) Grassland Survey (2024) SoDdGA Gweunydd Nant y Twyn - Arolwg Dosbarthiad Llystyfiant Cenedlaethol (2024) 2025-03-06 2025-09-23 NRW_DS161349 A standard Phase 2 NVC survey was undertaken at Gweunydd Nant y Twyn as part of the Site of Special Scientific Interest (SSSI) designation process. Gweunydd Nant y Twyn consists of a cluster of small fields, with tall, wooded hedgerows. The site is of particular importance for bryophytes. The site comprises the original Phase 2 site survey site of Mockridge et al. 1998, which has now been resurveyed (2024) and extended to include several contiguous small fields, and a further extension centred on 5 small nearby fields, approximately 1/3rd of a km to the north, linked by a block of woodland and pasture. The total area of the Phase 2 survey site is now 39.9ha. A standard Phase 2 NVC survey was undertaken at Gweunydd Nant y Twyn as part of the Site of Special Scientific Interest (SSSI) designation process. Gweunydd Nant y Twyn consists of a cluster of small fields, with tall, wooded hedgerows. The site is of particular importance for bryophytes. The site comprises the original Phase 2 site survey site of Mockridge et al. 1998, which has now been resurveyed (2024) and extended to include several contiguous small fields, and a further extension centred on 5 small nearby fields, approximately 1/3rd of a km to the north, linked by a block of woodland and pasture. The total area of the Phase 2 survey site is now 39.9ha. Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Natural Resources Wales (NRW) Maes-y-Ffynnon, Penrhosgarnedd, Bangor, Gwynedd, LL57 2DW, Wales enquiries@naturalresourceswales.gov.uk http://naturalresources.wales/?lang=en Habitats and biotopes GEMET - INSPIRE themes, version 1.0 2008-06-01 geonetwork.thesaurus.external.theme.httpinspireeceuropaeutheme-theme lowland grassland National Vegetation Classification (NVC) SSSI (Sites of Special Scientific Interest) Phase 2 Survey (Phase II) NRW Thesaurus 2026-03-04 geonetwork.thesaurus.local.theme.converted_nrw-keywords Part of this dataset is sensitive, and access may be restricted under relevant legislation. NRW may NOT publish or disseminate the sensitive data. Requests should be referred to NRW's Access to Information Officer. However, there are no access restrictions on non-sensitive data. NRW may release, publish or disseminate a redacted version of the data freely. noLimitations © CNC/NRW All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right. NRW does NOT grant permission to third parties to re-use or disseminate the full dataset. A redacted version of the data may be re-used under the terms of the Open Government Licence providing it is done so, acknowledging both the source and NRW's copyright. It is the recipient's responsibility to ensure the data is fit for the intended purpose. Contains Natural Resources Wales information © Natural Resources Wales and Database Right. All rights Reserved. Contains Ordnance Survey Data. Ordnance Survey Licence number AC0000849444. Crown Copyright and Database Right. Open Government Licence English biota Wales (WLS) -3.3711 -3.0474 51.517 51.6565 2024-06-13 2024-10-10 Westwood, S. & Bosanquet, S. 2025. NRW Lowland Grassland Survey and Site Description of ST 19/17 Gweunydd Nant y Twyn Revisit and New Annex. NRW Report No: 864, 25pp, Natural Resources Wales, Cardiff. Documents Unknown Geographic Information System Unknown Image Unknown https://datamap.gov.wales/layergroups/geonode:nrw_phase_2_grassland WWW:LINK-1.0-http--link Download Data & Web Services https://datamap.gov.wales/capabilities/layergroup/3600/?ows_service=wms OGC:WMS Web Mapping Service Commission Regulation (EU) No 1089/2010 of 23 November 2010 implementing Directive 2007/2/EC of the European Parliament and of the Council as regards interoperability of spatial data sets and services 2010-12-08 This dataset has not been assessed for conformance to the referenced INSPIRE regulation. false Standard National Vegetation Classification (NVC) survey techniques were used. The survey was carried out in-house by Natural Resources Wales (NRW) staff. Note, the Phase 2 survey site boundary does not coincide with the Gweunydd Nant y Twyn SSSI boundary, which excludes certain fields of more modified grassland. Gweunydd Nant y Twyn GIS data has been added to the Phase 2 Lowland Grassland Survey. One of the files contains sensitive species but this has been redacted before being published. Standard National Vegetation Classification (NVC) survey techniques were used. The survey was carried out in-house by Natural Resources Wales (NRW) staff. Note, the Phase 2 survey site boundary does not coincide with the Gweunydd Nant y Twyn SSSI boundary, which excludes certain fields of more modified grassland. Gweunydd Nant y Twyn GIS data has been added to the Phase 2 Lowland Grassland Survey. One of the files contains sensitive species but this has been redacted before being published.