ANKARA, Turkey—Jordan's King Abdullah II has called on world nations to help Jordan, Turkey and Lebanon shoulder "the tremendous burden" of caring for hundreds of thousands of refugees who have fled the violence in Syria.

Abdullah said Tuesday Turkey and Jordan would continue to provide assistance but urged the international community to contribute. The king was addressing reporters during a visit to Turkey.

The United Nations says there are some 925,000 displaced Syrians around the region and the number could increase to half a million this month.

Jordan is hosting more than 420,000 Syrian refugees, of whom 110,000 are sheltered in a desert camp near its northern border with Syria. Turkey is housing more than 180,000 refugees in 17 camps, while Lebanon has some 317,000.