Along with the 6.3 million Syrians displaced inside the country, these numbers show that a almost two thirds of all Syrians have been forced from their homes, the report said. A more recent driver of refugees is the conflict in South Sudan, where a breakdown in peace talks led to an outflow of 737,400 people by the end of past year, the report said.
Jan Egeland, Secretary General of the Norwegian Refugee Council (NRC) that tracks displacement across the globe said the system protecting refugees will collapse "if we do not step up our support to countries like Uganda".
The report showed despite huge focus on Europe's refugee crisis, it is the poorer countries that host most of the world's refugees.
"The worldwide neglect that you see here is matched nowhere else in the world", Grandi told The Associated Press on Sunday while visiting South Sudan's largest internally displaced camp in the town of Bentiu.
More than four million South Sudanese have been internally displaced and another two million have fled the country as refugees because of the four-year-old civil war.
And that number has ballooned by a further half million people since then, the agency said, stressing the most of the refugees had left since the "disastrous breakdown of peace efforts" last July.
But UN High Commissioner for Refugees Filippo Grandi said it was still a disheartening failure of worldwide diplomacy.
The fastest growing refugee population was spurred by the crisis in South Sudan while almost two-thirds of Syrians have been forced to flee their homes.
Syria's civil war is still the largest source of refugees (5.5 million), but the turmoil in South Sudan was newest largest factor, uprooting 1.87 million people to date.
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Syria's neighbours Turkey and Lebanon have taken in some 2.9 million and 1 million people, respectively, while Pakistan hosts 1.4 million mostly Afghan refugees.
Uganda needs more help from the global community in dealing with huge numbers of refugees from South Sudan, Amnesty worldwide said Monday.
By the end of 2016, 40.3 million people were internally displaced - a massive number but better than the 40.8 million figure registered the previous year.
Half of all refugees were children. Tragically, 75,000 asylum claims were received from children travelling alone or separated from their parents. "If we fail, we will be faced with a more unstable world, where the alarming high displacement figures will only continue to increase", said Egeland.
Anadolu Agency recently visited some of the refugee settlements and found shortages due funding shortfalls. "Borders must be kept open, but we can not expect a country like Uganda to shoulder the entire bill", said Egeland.
Globally, Syrians still represent the largest forcibly displaced population with 12 million refugees or internally displaced - some 65 percent of the population - by the end of 2016.