BETA — measurements and names under active refinement. Seen a sign, a gate, or a better name? Report it (photos welcome).

Pendine Hill

863.2 m · gain 88.3 m · overall 10.2% · Pendine · Sir Gaerfyrddin - Carmarthenshire

Shape: sustained — 36% of the climbing sits in a quarter of the distance; longest continuous stretch at 10%+ is 422 m.

Documented on the ground — tag: 20% (2026). Signs get repainted and tags get retagged, so the date is part of the fact; on no cycling list we know of.

Gradient ladder what do windows mean?

Window	Maximum	Located at
2 m (diagnostic)	21.3%	433–435 m
3 m (diagnostic)	20.4%	426–429 m
5 m	20.1%	424–429 m
10 m	19.9%	419–429 m
20 m	19.7%	415–435 m
25 m	19.6%	410–435 m
50 m	18.4%	400–450 m
100 m	15.7%	376–476 m

Map

Check this route yourself: Google Maps route via their router · Street View at the base where coverage exists · geojson.io our exact measured line · OpenTopoMap

Pendine Hill LiDAR hillshade map with contours

Profile

Provenance

{
  "analysis_version": "0.1.0",
  "sample_interval_m": 1.0,
  "interpolation": "bilinear",
  "smoothing": "none",
  "gradient_windows_m": [
    5.0,
    10.0,
    20.0,
    25.0,
    50.0,
    100.0
  ],
  "diagnostic_windows_m": [
    2.0,
    3.0
  ],
  "elevation_crs": "EPSG:27700",
  "elevation_resolution_m": 1.0,
  "elevation_tiles": [
    "data/cache/wales/dtm_1m/wg_del_35_222207_20210210dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_35_223207_20210210dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_35_223208_20210210dtm.tif",
    "data/cache/wales/dtm_1m/wg_del_6_222208_20210210dtm.tif"
  ],
  "calculated_at": "2026-08-12T09:12:00+00:00",
  "road_source": "OpenStreetMap (local PBF extract)",
  "road_attribution": "\u00a9 OpenStreetMap contributors, ODbL",
  "osm_pbf_path": "data/cache/pbf/wales-2026-08-11.osm.pbf",
  "osm_snapshot": "2026-08-10T20:21:40Z",
  "elevation_provider": "Welsh Government",
  "elevation_dataset": "Welsh Government LiDAR 1m DTM (2020-2023)",
  "elevation_licence": "Open Government Licence v3 \u2014 \u00a9 Crown copyright Welsh Government",
  "elevation_catalogue_layer": "geonode:welsh_government_lidar_tile_catalogue_2020_2023",
  "elevation_tile_ids": [
    "wg_del_35_222207_20210210dtm.tif",
    "wg_del_35_223207_20210210dtm.tif",
    "wg_del_35_223208_20210210dtm.tif",
    "wg_del_6_222208_20210210dtm.tif"
  ],
  "elevation_capture_dates": [
    "11-02-2021"
  ],
  "climb_origin": "osm_incline",
  "signed_gradient_pct": 20.0,
  "signed_source": "OSM incline tag -20% (editors=1, first tagged 2018-08-11)",
  "notes": "Promoted automatically from triage verdict=validated. EXTENDED by graph walk: +2 segment(s) at base, +2 at top (stop: base=no_descending_continuation, top=no_ascending_continuation; min_avg=2.0%). Review before adopting."
}