I am a Nigerian citizen and have booked a Turkish Airlines flight to Nigeria with 12 hours both ways (return) layover at Istanbul Airport. I have a Chinese residence permit.
Do I need a transit visa at Istanbul Airport to enter Istanbul for city sightseeing?
You will need to apply for a visa, but it looks like you can apply for an e-visa here.
From the FAQs, they say to check on whether you are eligible by starting a new application. Once you enter your country of citizenship/passport and the type of passport, the site says that a Nigerian citizen on an ordinary passport can get an e-visa.
