All but two of the 10 least happy countries in the world are in Africa, according to the UN World Happiness Report, released for the first time Monday.
Published by the Earth Institute of Columbia University, the report identified Denmark as the world's happiest country.
And apart from Canada, all the countries topping the list were in Europe, including Finland, Norway, The Netherlands and Switzerland.
The 10 least happy countries were Togo, Benin, Central African Republic, Sierra Leone, Burundi, Comoros, Haiti, Tanzania, Congo (Brazzaville) and Bulgaria.
The report was released at a UN conference in New York, convened by the government of the Himalayan Kingdom of Bhutan, on the theme: "Happiness and Well-being: Defining a New Economic Paradigm".
It was said to be part of ongoing debate by economists on how best to measure countries' progress beyond monetary valuations.
Bhutan, which topped the Asian region as happiest nation, was cited as an example for even richer countries like the US to copy.
Countries awash with wealth had a lot to learn from the kingdom of Bhutan, which was admired less for its gross domestic product than for its gross national happiness index, the report authors noted.