Delegates from the main countries hosting Syrian refugees met in Jordan on Sunday where the UN called for more support from the international community.
Four years into the Syrian conflict about 40 per cent of Syria's pre-war population of 23 million have left their homes.
The UN estimates there are nearly 2.7 million Syrian refugees, mostly in neighboring countries, and another 6.5 million who have been displaced in their homeland.
The Zaatari refugee camp has become Jordan's fourth-largest city and the world's second-largest refugee camp after Dadaab in Kenya, which holds nearly 360,000 people from Somalia.
However, Zaatari is not big enough.
On Wednesday, Jordan opened a third refugee camp designed to accommodate up to 130,000 people.
Jordan already hosts 600,000 registered Syrian refugees, but Jordanian officials estimate the real number is closer to 1.3 million.
Thousands continue to flee Syria on a daily basis, escaping the relentless carnage that has killed more than 150,000 people in three years.
"The truth is that the international support to the governments and the host communities has been minimal in relation to the needs and due to the protracted character of this crisis, this support needs to massively increase in the months to come," said Antonio Guterres, the UN High Commissioner For Refugees.
Lebanon, a tiny, fragile Arab country with a population of 4.5 million, has more than one million registered refugees - the highest per-capita concentration recorded anywhere in the world in recent history, according to the UN.
Unlike Jordan and Turkey, which have set up official camps, many Syrians in Lebanon live in appalling conditions, finding shelter in slums, tents and tin shacks in informal settlements across the country.
AP
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