I somehow forgot what you call a piece of land that extends into water–a peninsula (duh), but searching for the term brought me to this site and the map showing all the different types of terrain and water types is information-dense in a good way, and just plain cute.
Also, it reminded me what an isthmus is, other than a word your tongue wants to twist.
The site: https://brilliantmaps.com/important-geography-terms/
The map:
