SION MILLS covers 72.3 km² in Northern Ireland. With 17 historic sites and 3 scheduled monuments on record, the ward sits at the 57th percentile across all 462 NI wards for combined archaeological heritage. It also records 53 listed buildings (HED Historic Buildings Record), the 79th percentile for listed-building density across NI wards. Per 1,000 residents, this works out at 19.6 recorded sites — the 60th percentile across NI wards (a measure of heritage density relative to current population). Dated archaeological evidence runs from the Mesolithic through to the Post-Medieval period, spanning 4 archaeological periods, around the NI median for chronological depth.
Heritage at a glance
Percentile rankings throughout this profile compare each ward only against the other 461 Northern Ireland wards.
Population context
The recorded heritage of SION MILLS
Of the 17 historic sites recorded, the most common are Standing Stone (4, 24% of historic sites), Enclosure (4), and Standing Stone (Site Of) (1). For Standing Stones, this is the 48th percentile among NI wards that record this type. For Enclosures, this is the 38th percentile among NI wards that record this type. Across the ward's 72.3 km², this gives a recorded density of 1.01 sites per km² (all heritage types combined).
Most common monument types
| Type | Count | Description |
|---|---|---|
| Standing Stone | 4 | — |
| Enclosure | 4 | — |
| Standing Stone (site Of) | 1 | — |
Chronological distribution
Terrain and environment
Mean elevation of 66m sits around the NI median (53th percentile), reaching 150m at the highest point. Mean slope is 4.4° (56th percentile across NI), giving moderately undulating terrain. The Topographic Wetness Index of 10.2 (40th NI percentile) indicates moderate drainage, balanced between upland shedding and lowland accumulation. The land cover is dominated by improved grassland (80%) and woodland (10%).
Terrain measurements
Where this ward sits in NI
Geology and preservation
The dominant bedrock formed during the Neoproterozoic era (Carboniferous period). Late Pre-Cambrian rock laid down before the Cambrian explosion of life — a stable, long-eroded basement geology. Bedrock composition is varied (complexity index 0.89, on a 0-1 Simpson-style scale), with multiple geological units within the ward boundary. Geologically diverse wards historically offered a wider range of stone types for building, toolmaking, and quarrying — a relevant factor when interpreting the material culture of nearby sites.
Placename evidence
The combined OSNI, Logainm NI, and GeoNames sources record 27 placenames for this ward. Of those, 2 fall into the pre-Christian defensive category (rath-, dún-, lios-, caiseal-) — the only diagnostic heritage stratum identified beyond the generic Gaelic landscape substrate. Note: Irish-language (name_ga) forms are recorded for roughly half of NI placenames in the combined sources, so anglicised forms whose Irish original could belong to multiple categories may be misclassified.
Placename categories
Scheduled monuments in SION MILLS
Scheduled monuments are sites legally protected under the Historic Monuments and Archaeological Objects (Northern Ireland) Order 1995, designated by the Historic Environment Division (HED).
| Monument | Type | Period |
|---|---|---|
| Platform Rath | Platform Rath | Early Medieval |
| Platform rath | Platform Rath | Early Medieval |
| Court tomb: Carnmore | Court Tomb: Carnmore | Neolithic |
Recorded historic sites
| Name | Period | Type |
|---|---|---|
| A.P. SITE – rectangular enclosure | Iron Age | Unknown |
| CASTLE AND BAWN | Post-Medieval | Defence |
| COURT TOMB: CARNMORE | Mesolithic | Ritual/Funerary |
| ENCLOSURE | Iron Age | Unknown |
| ENCLOSURE | Iron Age | Unknown |
| ENCLOSURE | Iron Age | Unknown |
| ENCLOSURE | Iron Age | Unknown |
| MEGALITHIC TOMB | Mesolithic | Ritual/Funerary |
| PLATFORM RATH | Early Medieval | Defence |
| PLATFORM RATH: TIEVENNY FORT | Early Medieval | Defence |
Listed buildings in SION MILLS
| Address / Name | Grade | Period |
|---|---|---|
| Church of the Good Shepherd Melmount Road Sion Mills Co. Tyrone BT82 9ET | B+ | 1900 – 1919 |
| Sion Mills Recreation Club 151 Melmount Road Sion Mills Co Tyrone BT82 9EX | B2 | 1880 – 1899 |
| 1 Mill Avenue Sion Mills Co. Tyrone BT82 9ET | B2 | 1880 – 1899 |
| Sion Mills (Former) Elementary School 147 Melmount Road Sion Mills County Tyrone BT82 9EX | B1 | 1860 – 1879 |
| 122 Melmount Road Sion Mills Co. Tyrone BT82 9EU | B2 | 1900 – 1919 |
| 124 Melmount Road Sion Mills Co. Tyrone BT82 9EU | B1 | 1900 – 1919 |
| 'The Brae' 104 Melmount Road Sion Mills Co Tyrone BT82 9PY | B1 | 1900 – 1919 |
| New Bridge Old Bridge Road Newtownstewart, Co Tyrone | B1 | 1800 – 1819 |
| Ricardo Monument, Church of the Good Shepherd, Melmount Road Sion Mills, Co Tyrone BT82 9ET | B1 | 1920 – 1939 |
| Herdmans' Mill Mill Avenue Sion Mills Liggartown Strabane Co Tyrone BT82 9HE | B+ | 1880 – 1899 |
Discover more in Derry City and Strabane
Want a deeper view?
Grounding History: 10 Maps of Northern Ireland’s Past
A spatial history report bringing together analysis of all 462 wards into one place through 10 high-quality maps — covering monument density, archaeological periods, placename heritage, terrain, wetland, and the historic landscape at first survey.
About this profile
What is a ward?
A ward is the smallest electoral and statistical geography used by the Northern Ireland Statistics and Research Agency (NISRA). The boundaries used here are the 2014 NISRA / OSNI Wards (462 across Northern Ireland), each typically covering 1-700 km² and a population of a few thousand. Wards do not align with parishes, townlands, or any historic administrative unit — they are a modern statistical convenience, used here only as a fixed spatial frame within which to summarise heritage records.
What counts as a site?
Three distinct heritage record types are reported separately, not combined: (1) Historic Sites — entries in the Northern Ireland Sites and Monuments Record (NISMR), the inventory of recorded archaeological sites and findspots, dated from prehistoric to early-modern; (2) Scheduled Monuments — sites legally protected under the Historic Monuments and Archaeological Objects (NI) Order 1995 and maintained by the Historic Environment Division (HED); (3) Listed Buildings — buildings of architectural or historic interest protected under the Planning Act (NI) 2011 and graded A, B+, B1, B2, or Record-Only by HED. A site appearing in more than one register is counted in each register independently.
Editorial principles
These ward profiles describe evidence, not history. They report what is recorded, not what occurred. Where the data is ambiguous, we say so. We do not infer historical processes — population movements, settlement expansion, periods of decline — from patterns in the record. Absence of evidence is not evidence of absence: in Northern Ireland, where antiquarian survey was uneven and modern excavation is geographically biased, a gap in the record almost always reflects the limits of recording rather than a genuine historical absence. We mark such gaps explicitly where they appear in the data.
Limits of coverage and known caveats
Several caveats apply to every ward profile: (1) NISMR coverage is uneven across NI — some areas (notably parts of the south-east and the Belfast urban fringe) have been more intensively surveyed than others, so a low recorded site count does not reliably indicate a low past density of activity; (2) period attributions in NISMR are often 'Unknown', and chronological breakdowns reported here reflect only the dated subset; (3) placename classification depends on the Irish-language form (name_ga), which is recorded for approximately 50% of NI placenames in the combined sources, so ecclesiastical and pre-Christian counts may be understated where anglicised forms remain unparsed; (4) terrain percentile ranks compare each ward only to the other 461 NI wards; they are not absolute thresholds. For absence-dominant land cover categories (wetland, water, cropland), percentile ranks are suppressed below 1% raw value, since the ranking of zero-value wards is not meaningful.
Data sources (11)
- Northern Ireland Sites and Monuments Record (NISMR) https://www.communities-ni.gov.uk/articles/nismr-public-mapviewer
- HED Scheduled Monuments Dataset https://www.opendatani.gov.uk/@historic-environment-division/scheduled-monuments-northern-ireland
- HED Historic Buildings Record https://www.communities-ni.gov.uk/topics/historic-environment/listed-buildings
- OSNI OS Open Names (Northern Ireland) https://www.opendatani.gov.uk/@ordnance-survey-of-northern-ireland/osni-open-data—50k-gazetteer
- Logainm — Placenames Database of Ireland https://www.logainm.ie/
- GeoNames https://www.geonames.org/
- Census 2021 (Northern Ireland) https://www.nisra.gov.uk/statistics/2021-census
- OSNI Open Data — Largescale Boundaries https://www.opendatani.gov.uk/@ordnance-survey-of-northern-ireland/osni-open-data-largescale-boundaries-wards-2012
- Copernicus GLO-30 DEM https://spacedata.copernicus.eu/collections/copernicus-digital-elevation-model
- ESA WorldCover https://esa-worldcover.org/
- GSNI 1:250,000 Geology https://www.bgs.ac.uk/geological-data/maps/