The Roman fort at Birdoswald on Hadrian's Wall sitting high above the steep-sided (and eroding) valley of the River Irthing. The wall itself attaches to the northern corners of the fort running eastwards to a mile-castle just before the steep descent to the river. The Vallum appears at the west of the plot with (intriguing) earthworks just to the north. Sky-view factor plot using EA 1m-centred data.
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