Which country is the most peaceful?

The 21st September is International Day of Peace. The 2019 theme is climate action for peace and the website has a number of resolutions and other resources relating to this.

but on a more general theme here are some resources on the state of peace in the world.

Which is the most peaceful country in the World?
the Global Peace Index 2019 ranks Iceland. Find out why by consulting its methodology. The index has been produced annually by the Institute for Economics and Peace since 2007. It ranks over 160 nations according to their levels of peacefulness.

What peacekeeping operations is the UN involved in and how effective are they?
Global Peace Operations review
annual survey of UN peacekeeping operations.
Data on UN peace keeping operations including number of personnel, gender and budgets. Maintained by New York University Center for International Cooperation. Also includes analysis articles and news stories.
the official United Nations website has some good infographics on statistics. They include women in peacekeeping. There is also a more detailed data section with  reports on current missions and data on all deployments since 1949.

Historical information on peacekeeping missions

SIPRI Multilateral Peace Operations Database contains information on all peace keeping missions UN and non UN since 2000

Free peace treaties.

Margarita S. Studemeister Digital Collections in International Conflict Management

maintained by the United States Institute for Peace (USIP)containsa  a peace agreements collection which has the text of all major documents ending civil and inter-state wars since 1989; 

UCDP Conflict Encyclopedia
The Uppsala Conflict Data Program offers free access to this searchable database which has detailed descriptions of  armed conflicts, peace agreements, state and non-state violence covering over 40 years . You can  country files, visualise the data and download.