// Summit Granite · Highest Dartmoor

Yes Tor &
High Willhays

Northern Dartmoor — highest ground in England south of the Pennines, 621m ASL

OS Grid: SX 580 901  ·  Summit: 621m ASL  ·  Classification: Dartmoor NPA · MoD
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// Geological & Operational Record

The Roof of Southern England

Yes Tor and High Willhays form the summit ridge of northern Dartmoor — the highest ground in England south of the Pennines. High Willhays at 621 metres is the true summit; Yes Tor at 619 metres, two metres lower and slightly to the north, carries the trig point and is the more prominent of the two in views from below. The ridge runs roughly north-south across the bleakest and most exposed section of the high moor, with the Meldon Reservoir and the West Okement valley falling steeply to the west.

The geology is characteristic high-moor granite — the same Dartmoor batholith exposed across the entire plateau, but here at its most austere, with the rock exposed in large flat sheets and angular tors where the periglacial climate stripped the hillsides to bedrock. No trees, little cover, and wind that accelerates across the exposed ridge. Capture conditions here are severely weather-dependent: the window for acceptable flying is narrow, typically a high-pressure anticyclone in early morning before the sea breeze builds.

The strategy for reconstruction is to focus on the tors themselves rather than attempting to capture the wider moorland. Grass and heather produce poor splat quality; the granite formations — cracked, weathered, patinated — will be excellent. The approach is to document the summit tor masses at multiple altitudes, using the landscape as atmospheric context rather than primary subject matter. A 5am departure on a zero-wind morning is the target.

Note: the area falls within the Dartmoor Military Training Area. Drone operations require clearance from the relevant MoD authority and should never be conducted during live firing days.

// Site Chronology

Geological & Human History

~290 Ma
Granite intrusion — Dartmoor batholith emplaced. Northern Dartmoor forms the highest part of the granite outcrop.
~10,000 BC
Periglacial exposure — Post-glacial erosion strips summit to bedrock. Tor formation by freeze-thaw along joint planes.
Bronze Age
Upland use — Bronze Age trackways cross the northern moor. Summit ridge likely used as a landmark and territorial boundary.
20th C
Military use — Dartmoor Military Training Area established. Live firing range on northern Dartmoor. Summit accessible outside firing periods.
1951
National Park — Dartmoor National Park designated. High Willhays and Yes Tor identified as the park's highest points.
2025
Hylas Spatial survey — Survey window awaiting. Zero-wind requirement strictly observed. MoD clearance required before any capture.