What is the approximate longitude of mainland africa's westernmost point

The approximate longitude of mainland Africa's westernmost point is 17°31'50.2"W.

It is the section of the city Dakar in the country Senegal.

Dakar is an incredible historic metropolitan city and the capital of Senegal. It is one of the greatest harbors in West Africa and a city renowned as a venue for the performances of the Paris-Dakar Rally. Moreover vast airport is also instituted near the city, which receives travelers throughout the world.

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