"Arab unity is a very important element in order to allow this region to be stabilised and for... The Syrian refugees to find again a future that corresponds to their aspirations," Guterres said.
Speaking on the eve of an Arab League summit hosted by Jordan, the UN chief said: "When Arab countries are divided, it has allowed others to intervene and to manipulate situations, creating instability, breeding conflict and facilitating the lives of terrorist organisations."
Syria's conflict began with protests against President Bashar al-Assad in 2011 but has turned into a brutal war pitting government forces, jihadists, rebels, and Kurds against each other.
The war has killed more than 320,000 people and forced 4.9 million people to flee their country.
In Jordan, where the UN High Commissioner for Refugees (UNHCR) says it has registered 630,000 Syrians, the government says it is hosting 1.4 million.
Jordan says the influx has strained its resources and has insisted it must screen newcomers to ensure they are genuine refugees and not jihadists seeking to infiltrate the country.
"How sad it is, how terrible it is, that today we still have Zaatari camp... And that the tragedy of Syrians is going on and on and on," he said.
He urged the international community to step up humanitarian aid to the refugees in Jordan and other regional countries that are hosting them.
"I hope that if all countries that have an influence on the Syrian situation are able to come together these refugees that are living here artificially now for more than four years in this camp will be able to restart their lives again, to find jobs, to work, to have a normal life.
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