The Prime Meridian is a line of longitude that runs from the North Pole to the South Pole and is defined as 0 degrees longitude. It does not have ending points in the traditional sense, as it is a continuous line.

However, we can think of its "end points" as:

* North Pole: The Prime Meridian intersects with the North Pole.

* South Pole: The Prime Meridian intersects with the South Pole.

So, the Prime Meridian doesn't have "ending points" in the way that a road might, but rather it ends at the poles where all lines of longitude converge.