hedge, fence, wall
垣 centers on a barrier that encloses or divides space: a hedge, fence, or wall. All three meanings are physical boundaries, often made of earth or plants.
垣 combines 土 (earth) with 亘, which likely contributes the sound and the idea of spanning or enclosing. Together they suggest an earthen boundary such as a wall or hedge.
The left side is earth 土, and the right side 亘 looks like a barrier stretching across. Picture a low earthen wall or hedge made of packed soil.
For エン, imagine an endless earthen wall enclosing a garden: endless -> エン, and the wall is made of earth.
stone wall
roofed mud wall around a villa or temple
fence; hedge; railing
hedge; fence
to take a peep at; to catch a glimpse of
hedge
bamboo fence (hedge)
middle fence
wall of people; crowd of people lined up (e.g. spectators); throng of people
fences within fences
friend
square-patterned bamboo fence; lattice fence
to put up an (emotional) wall (between two people); to become distant
a wholesome household can not be disturbed from the outside; a house divided against itself cannot stand; a firm fence keeps the dogs out
over the fence (e.g. looking, conducting a conversation)
to look over the fence
hedge; fence
springtime repairing of fences after winter damage
gap (in a fence or hedge); chink; opening
to get wind of