Since July 1, 2013 Senegal now requires visas. You can apply online and then do the fingerprint and photo requirement at Dakar and other certian land border posts upon arrival. Cost 50 Euro and you can request multiple entry visas on arrival in Senegal when you get the visa stamped into your passport.
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Oh wow...really???? That is really strange. When I went to Dakar, Senegal I didn't need visas to get to Dakar, Senegal on July 2022!
I'm a US Citizen and I'm so fortunate I didn't need a visa to visit Senegal. Hope you were able to go visit!