If you were on foot you would need to be a good swimmer, because you would be In the Atlantic Ocean, or more specifically, in the Gulf of Guinea, due south of Accra, Ghana, and due west of Libreville, Gabon.
It is where the Prime Meridian crosses the Equator.
However, hopefully you would be on a boat enjoying the heat of the day and the warm sea breezes, or in an airplane admiring the view.
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0 degrees longitude
longitude
The prime Meridian is 0 degrees longitude.
The prime meridian is a line at 0 degrees longitude.
The Equator is 0 degrees latitude, and the Prime (or Grenwich) Meridian is 0 degrees longitude.
longitude.
latitude 0 degrees.
The prime meridian is a line at 0 degrees longitude.
The equator is at 0 degrees latitude.
That would be Greenwich.
In water, somewhere off the coast of Africa.
In the middle of the Pacific