HERZLIYA, Israel — An Israeli college has quietly conducted an opinion poll in Saudi Arabia, concluding that the Saudi public is far more concerned about the threats of Iran and the Islamic State than Israel and that the vast majority of Saudis support a decade-old peace offer to the Jewish state.

The survey conducted by the Interdisciplinary Center in Herzliya provides Israelis with a rare glimpse inside Saudi Arabia and may change Israeli perceptions about the desert kingdom. The two countries are longtime foes with no diplomatic relations.

The poll found that 53 percent of Saudis named Iran as their main adversary, while 22 percent said it is the Islamic State, and 18 percent said Israel. The poll, conducted in conjunction with the University of Wisconsin Milwaukee, surveyed 506 Saudis over the phone and had a margin of error of 5 percentage points. It was carried out over the past two weeks.