The options on PlotGeometry for controlling the appearance of the geometry (not the labels) are:

• stroke - edgecolor for polygons, line color for lines
• marker - What symbol is used for points
• fill - fill color for points/polygons

It doesn't appear we have any option for the stroke/line width. I can see adding it as stroke_width, but I do hesitate a bit because I don't want to add attributes for every matplotlib option. On the other hand, we probably should add it since, as you noted, we do have the option for the map features.

I think given that last sentence, I lean to adding it. @dcamron @kgoebber any thoughts?

Originally posted by @dopplershift in #2718 (comment) (thanks @sudokoko for starting the discussion!)