Devil's Grave
The Devil's grave is located at Stormy Point - a shallow mine working that probably yeilded copper. It was here that Colin and Susan first meet the svart-alfar as they came pouring out from the mines and chase them down the Edge:
'Then they ran clear of the trees and onto Stormy Point. But their relief was short-lived; for whereas till that moment they had been fleeing from twenty or so, they were now confronted with several hundred of the creatures as they came out of the Devil's Grave like ants from a nest.'