Visitors to Sri Lanka visiting for tourism purposes must obtain an Electronic Travel Authorization (ETA) prior to arrival or on arrival to Sri Lanka. Holders of ETA from all countries except the 3 exempt countries obtain a visa on arrival that is valid for 30 days. The Business purpose ETA can be obtained only from Sri Lankan diplomatic missions, head office of the Department of Immigration and Emigration and on arrival at the port of entry. All visitors must hold a passport valid for 6 months. Nationals of Afghanistan, Iran, Iraq, Nigeria, Pakistan, Somalia and Syria must hold return or onward tickets. Visitors are strongly urged to use the online system to avoid lengthy delays at the port of entry.