I love inset maps as an additional element in #dataviz to facilitate reading the plot. Here is an example from my recent paper on regional differences in older adult mortality in DK
Preprint: https://osf.io/y9ke4
#rstats code: https://github.com/ikashnitsky/mun-non-surv
#30DayMapChallenge | Day 28: Is this a chart or a map?