IOM Yemen DTM’s Flow Monitoring Registry (FMR) monitors migrant arrival on the southern coastal border and Yemeni return locations on Yemen's northern border with the Kingdom of Saudi Arabia (KSA). Enumerators placed at Flow Monitoring Points (FMPs) record arrivals of migrants and returning Yemeni nationals in order to identify different patterns of migration, and to provide quantitative estimates to help define the population of irregular migrants entering the country. FMR is not representative of all flows in Yemen and should be understood as only indicative of the individuals recorded at FMPs during the time frame indicated. Access constraints limit the ability to collect data at some migrant arrival points..
In July 2021, IOM Yemen DTM estimates that 1,566 migrants entered Yemen, compared to 3,545 migrants in June 2021. The drop in numbers is because July saw extreme weather conditions, including strong winds, heavy rainfall and high tides, which made it difficult for migrants to travel by boat. Additionally, DTM estimates that 1,821 Yemeni returns from KSA during the month of July 2021, compared to 1,231 in June 2021. During the period between 1 January and 31 July 2021, an estimated 11,555 migrants and 3,052 Yemenis arrived in Yemen.