Map of Least Developed Countries (LDCs) listed by the UN. 
Source of the country list: on http://unohrlls.org/about-ldcs/ 
There were total of 48 countries listed.
Based on the decision dated 4th dec., 2013, both Equatorial Guinea and Vanuatu are due to graduate in 2017. See e.g. https://www.un.org/en/development/desa/policy/cdp/ldc/ldc_list.pdf.

Base map used Blank world map with subnational borders, without Antartica.svg, by User:OSeveno
Own work
Paju