How: create a map in Google's MyMaps (requires a google account). embed in Notion.
https://www.google.com/maps/d/edit?mid=1CBgYxj-gfUKo13KUICQv6SmyCWVpYUjQ&usp=sharing
Create a geojson in geojson.io, save to Gist with a Github account, embed the Gist.
https://gist.github.com/cmrRose/a02d3b3f7f4118d793ad2e82ff5de0da