Viewpoints: Impact of Syrian refugees on host countries
UN agencies say the number of children forced to flee Syria has reached one million, describing the figure as "a shameful milestone".
Overall, more than 1.7 million people have registered as refugees since the uprising against the rule of President Bashar al-Assad began in March 2011, with many more believed to be unregistered.
Although Syrian refugees have fled to numerous countries, the vast majority have ended up in Lebanon, Jordan and Turkey.
Lebanon - the smallest of the three, with a population of four million - has more than 700,000 registered refugees. Jordan and Turkey are hosts to more than 960,000 others.
Three experts discuss the how the countries are dealing with the influx.