Metalknights allows you to create your own maps and if the Map Committee approves them they get uploaded on the servers. But before you even consider sending your map to the Map Committee it must be free of any errors. For an introduction into map making go to the Cartographers corner. As it's quite easy to miss some of the errors I've written a small program that does this for you. The Map Checker will find all errors, takes into account if a map wraps, finds neighboring cities, lonely farms and so on.

There is no installation necessary. Just extract the 3 files and put them in the MK directory. To check a map just start the program and open a map. You will then automatically get a list with all errors (if there are any ;-)).

Download MapChecker here