Sometimes a mapping error is just a mistake, as when a textbook inadvertently leaves the upper peninsula of Michigan off a map of the U.S. (via GeoCarta) or when a certain V. Putin’s Web site shows four Russian-occupied islands as belonging to Japan (via Vector One). That doesn’t stop residents from getting insulted (in the former case) or academics from getting excited (in the latter case).

But sometimes an “error” is deliberate — as when Colorado Ski Country USA’s map of ski resorts leaves off the four resorts that stopped paying them dues (via GeoCarta).