In order to obtain a Sudan visa, travelers must submit a completed visa application form, along with a passport-sized photo and a valid passport. Travelers may also be required to provide proof of travel insurance, as well as proof of sufficient funds to cover their stay in Sudan. Depending on the purpose of travel, visitors may also need to provide additional documentation, such as a letter of invitation or business letter. The Sudanese embassy or consulate will then review the application and supporting documents, and issue the visa if everything is in order. The entire process can take several weeks, so it's important to start the process well in advance of your planned trip.