The Nordic nation of Finland is crowned the world's happiest country for the fifth year in a row, by a yearly United Nations-sponsored index, which also found Afghanistan as the unhappiest, closely followed by Lebanon.
The latest list was completed before the Russian invasion of Ukraine.
Bulgaria, Romania and Serbia recorded the biggest boosts in wellbeing. The largest falls in the World Happiness table, released on Friday, came in Lebanon, Venezuela and Afghanistan.
Lebanon, which is facing an economic meltdown, fell to second last on the index of 146 countries, just below Zimbabwe.
War-scarred Afghanistan, already bottom of the table last year, saw its humanitarian crisis deepen since the Taliban returned to power last August following the pull-out of United States-led troops.
"This (index) presents a stark reminder of the material and immaterial damage that war does to its many victims," co-author Jan-Emmanuel De Neve said.
The World Happiness Report, now in its 10th year, is based on people's own assessment of their happiness, as well as economic and social data.
It assigns a happiness score on a scale of zero to 10, based on an average of data over a three-year period.
Northern Europeans once again dominated the top spots – with the Danes second to the Finns, followed by the Icelanders, the Swiss and the Dutch.
The U.S. rose three places to 16th, one ahead of Britain. France climbed to 20th, its highest ranking yet.
As well as a personal sense of wellbeing, based on Gallup polls in each country, the happiness score takes account of the gross national product (GDP), social support, personal freedom and levels of corruption.
This year, the authors also used data from social media to compare people's emotions before and after the COVID-19 pandemic. They found "strong increases in anxiety and sadness" in 18 countries but a fall in feelings of anger.
"The lesson of the World Happiness Report over the years is that social support, generosity to one another and honesty in government are crucial for wellbeing," report co-author Jeffrey Sachs wrote.
"World leaders should take heed," he added.
On Helsinki's market square on Friday, next to the still-frozen Baltic Sea, Jukka Viitasaari said he was not surprised that Finns describe themselves as happy.
"Many things are undeniably good here – beautiful nature, we're well-governed, lots of things are in order," the business owner told AFP.
The country of vast forests and lakes is also known for its well-functioning public services, ubiquitous saunas, widespread trust in authority and low levels of crime and inequality.
Nonetheless, the report raised some eyebrows when it first placed Finland at the top of its listings in 2018.
Many of the Nordic country's 5.5 million people describe themselves as taciturn and prone to melancholy, and admit to eyeing public displays of joyfulness with suspicion.
"Someone from outside needed to tell us that we had it good compared to lots of other places," Viitasaari said.
"But after five years of coming top (of the rankings) we're getting used to it!"
