Recent cross-national studies4 show large variations in levels of internal migration across countries and both within and between geographic regions. Measured over a period of one year or five years, high levels of internal migration are generally found in high-income countries in Oceania (Australia and New Zealand), Northern America, Northern and Western Europe and Eastern Asia (Japan and the Republic of Korea). Internal migration has been generally low in Eastern Europe and in South-Central, South-Eastern and Western Asia. Substantial variation exists among countries in Africa and in Latin America and the Caribbean.