This is a 3000x3000 map I made in Photoshop CS6 of an island used by Silt Pirates for my Dark Sun campaign. The leader of the pirates is an evil earth cleric hence the shrine in the ruins building he occupies.

The vehicles are sail powered silt skimmers which can navigate shallower areas of the Silt Sea using their 25 ft diameter wheels.

I have also attached a link to a .png file of the island with no silt sea and no skimmers so it can be used in non Dark Sun campaigns more easily.

Click image for larger version. 

Name:	Silt-Island.jpg 
Views:	637 
Size:	1.55 MB 
ID:	55531

.png file with no silt sea background or skimmer vehicles