The refugee and displacement problem is one of the most complex humanitarian issues facing the Middle East, aid workers say. Elizabeth Campbell, senior advocate at US NGO Refugees International, believes it is likely the Middle East hosts the highest number of refugees and asylum-seekers in the world. She underlined the need to find lasting solutions: 'Any time that people remain uprooted and have not been afforded basic rights or pathways to durable solutions, it is a humanitarian crisis. In this article from IRIN, the refugee challenges of the countries in the region are profiled.