The need for a feature like this comes from the Greater Wellington Regional Council and the description used on way markers of "Farm Hub" in Belmont Regional Park, especially on the Porirua side.

In this form it becomes a searchable destination.

I tried circles with varying diameters.  

On reflection, I think (in this usage, at least) the circle could be a tad bigger.  The size of the rectangle looks good.

In my experience, using just a locality marker does not give the visibility needed in the range of zoom levels.

I would appreciate any positive 

I am more than content to continue to experiment with the objective of achieving clarity at all zoom levels.