To avoid the list becoming infinitely long and arbitrary, only hills with more than 30 m relative height (rising over 98 ft) are included.
Topographically, the boundaries of the Lake District trace the flow of streams from the lowest point between it and the Pennines.
This occurs just north of the Howgill Fells and gives the boundaries as, primarily, the River Eden and River Lune.
The parent Marilyn of hill A can be found by dividing the nearby area into territories, by tracing the runoff from the key col of each Marilyn.
The parent is the Marilyn whose territory hill A resides in.