it was a fence along the bottom of a ditch to stop it from spoiling the view.(italics not intended!)
I thought it was a hidden ditch.
You'd come across suddenly......
It's a drop between the owner's garden and the parkland beyond. There's no physical barrier (like a hedge or fence) to obstruct the view, but animals can't get in, The impression is one of a continuous, unbroken piece of land, without the problem of stray coos trampling your prized cabbages!
It was a trick often employed in gardens of large country houses, but can be used by anyone.
As shown here
and as described here https://en.wikipedia.org/wiki/Ha-ha
You'll have had your tea?
Big Hoose? Or Ha-ha?
Ah ha! Perhaps this is what has confused the OP
https://en.wikipedia.org/wiki/French_formal_garden (Scroll down to Perspective)
Steve - where did you get that pic of my brother in law?
A big hoose has big coos...
Presumably muckle coos....
Eek! There's a moose loose aboot this hoose!
DAVID. There is a herd of those 'red cows', in Steves post above, AA's I believe, about a mile from here. Have you seen them on the right hand side by the big house just outside Armitage.
They would make good camera fodder for you. No pun intended but it's a goodun