From A Wiki of Ice and Fire
and the location of the Prince's Pass
The Prince's Pass is one of the principal overland routes from the Stormlands to Dorne. It is located in the Red Mountains of Dorne.
The Prince's Pass descends from the mountains into the deep sands of Dorne. Structures along the route include Skyreach, Kingsgrave, and the Tower of Joy. North of the Prince's Pass is Nightsong in the Dornish Marches. Unlike the Boneway, the Prince's Pass does not appear to have a proper road. The head of House Fowler acts as Warden of the Prince's Pass.
The Three Leaves, three members of House Oakheart including Alester and Ser Olyvar, died in the Prince's Pass at the side of the Young Dragon, Daeron I Targaryen.
The Winds of Winter
Two Dornish hosts have massed in the Boneway and the Prince's Pass. The hosts sit encamped, waiting for Prince Doran Martell to loose them on the enemies of House Martell.
References and Notes