Magic wand to isolate the continents, then again to fill and once more (using stroke) for the outline. Darker green and yellow on layers.
step 2 of 6
Decided to put the map on parchment, so I used color adjustment and levels to change the colors.
step 3 of 6
The parchment was made by using lighter yellow and darker yellow in splotches and then blurring. The border is two layers of smudged paint.
step 4 of 6
Elliptical marquee tool and pen tool (using stroke) to make the compass. Details were drawn in using a calligraphy brush. Radagund font for compass points.
step 5 of 6
I used a silk road map as a reference for the routes and checked with different maps for the names of the stopping points. Drew in the water falls and sea monsters. Radagund font for the text.
step 6 of 6
Drew in the creases and splotches. Used liquify to tatter the edges.