There are no geographic lines that are parallel to the Prime Meridian.
Technically, every meridian of longitude is parallel to every other meridian of longitude,
but only over an infinitesimal distance north or south of the equator. I'm quite sure
that's not what you're looking for.
Lines of longitude.
Lines of longitude.
Vertical lines parallel to the prime meridian are lines of longitude.
The only lines that can run parallel to the Prime Meridian on any map are other meridians of longitude, and the only map on which they can be printed parallel to it is a Mercator Projection. They are not really parallel to the Prime Meridian.
The Prime Meridian is an imaginary line. All longitudes are reckoned as angles from it, and all parallels of latitude cross it.
The imaginary north-south lines parallel to the prime meridian are called lines of longitude or meridians. They measure the distance east or west of the prime meridian, which is designated at 0 degrees longitude. These lines converge at the poles and are widest apart at the equator, helping to define geographical coordinates for navigation and mapping. Each degree of longitude is approximately 69 miles apart at the equator but converges as it approaches the poles.
The imaginary line is called the Prime Meridian.
prime meridian
Prime Meridian
Idek
The Prime Meridian and the Equator
equater i think