The Atlantic's Richard Florida has a great piece on this, going on to compare the GPI rankings to a range of other social, economic and demographic factors. You can read it here
The map below charts the Global Peace Index (GPI) scores for 153 countries worldwide. The GPI is based on 25 separate indicators of internal and external conflict, including wars and external conflicts, deaths from external conflicts, militarization, weapons exports, homicides, access to weapons, violent political demonstrations, prison populations, and police presence.
The Ten most peaceful nations in the world are:
Also, here are the rankings of a few nations in the region that I'm sure some of you would like to know.
In summary, Western Europe is the most peaceful region in the world while Sub-Saharan Africa is the least peaceful. Generally speaking, affluence and peace are closely correlated which explains why rich Nordic countries consistently rank as the most peaceful, most equal and happiest in the world.
To play around with interactive map, go here.