Altair [doesn't allow making maps (aka mark_geoshape
) interactive][altair-issue], since
geo markers do not yet support interaction in Vega-Lite
([vega/vega-lite#3306][vega-lite-issue]).
I stumbled upon this problem when I needed to only display information in only one US state, but the [official example][map-example] shows the full map of the US. Furthermore, it's not possible to set a fixed zoom, so that only one state is visible when the map is shown.