Smallest countries with the longest coastline - with restrictions
No Island nations! (Because almost all of them would just be archipelagos) Ratio between coastline and country size has been calculated as follows: Coastline/Size. So km by km² coastline. Including Overseas Territory.
Source for Size: Wikipedia
Source for Coastline: https://www.jetpunk.com/info/countries-by-coastline
I think its the coastline until senegambia bridge, because at this point, the river becomes really narrow and starts to definitely become a river, not a bay. Google Maps measurements like this also result similar to my source