The United Nations Disengagement Observer Force (UNDOF), based on the tense border between Syria and Israel, has seen its numbers dwindle to around 530 from 1,050 after Japan and Croatia withdrew their contingents.
Austria, previously the top contributor, will pull out its 377 soldiers by the end of this month amid fears of escalating violence against peacekeepers, leaving a 530-strong force from the Philippines and India.
"This mandate of UNDOF in the Golan Heights is very important for maintaining peace and security in the region, not only in that area," Ban told reporters in Geneva.
UNDOF and the related 76-member UN Truce Supervision Organization monitor a ceasefire accord signed a year after the 1973 Yom Kippur War -- a conflict which saw Israel take over a slice of the strategic Golan Heights from enemy Syria.
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Ban said he was in talks with several European countries, including Sweden, in search for new troops.
"They are in the process of discussing among themselves, and within their governments," he said.
He noted that, beyond Europe, Fiji has already stepped in to help.
But the UN peacekeeping department would prefer the force's total deployment to be around 1,250.
Ban said he was hopeful that the UN would find troops to "fill the gap", and expressed confidence that "we are on the way".