Henry Ernest Dudeney/Puzzles and Curious Problems/213 - A Swastikaland Map

by : $213$

 * A Swastikaland Map
 * Here is a puzzle that the reader will probably think he has solved at almost the first glance.
 * But will he be correct?


 * Swastikaland is divided in the manner shown in our illustration.


 * Dudeney-Puzzles-and-Curious-Problems-213.png


 * The Lord High Keeper of the Maps was ordered so to colour this map of the country
 * that there should be a different colour on each side of every boundary line.
 * What was the smallest number of colours that he required?