Not to be rude, but posting something like this, without some background info (like the map it can be found on) is a bit like showing 1 piece of a jigsaw puzzle and asking which puzzle it belongs to. If you have the source, you should be able to find out more about the image, and THAT might lead you to what you want.

BTW, Welcome to the Guild, The Mappiest Place on the Web, and with a bit more info, we MIGHT be able to help a bit more. No gaurantees though...