A Syrian teenager trapped for two years in Homs on Thursday became the 1 millionth refugee to register in Lebanon, marking what the United Nations called a "devastating milestone."
The conflict in Syria, a country with a prewar population of 23 million, has killed more than 150,000 people, according to the Britain-based Syrian Observatory for Human Rights, and has uprooted millions.
The United Nations estimates that more than 2.5 million Syrians are registered refugees in nearby countries, with more than 47,700 more awaiting registration. In addition, hundreds of thousands have fled Syria and have not registered as refugees.
Here are neighboring countries and the number of Syrian refugees who have registered:
Lebanon: more than 1 million