U.SCNU seachannel

a continuously sloping, elongated depression commonly found in fans or plains and customarily bordered by levees on one or two sides

12 features in 6 countries.

#CountryFeaturesShare of the world
1FinlandFI3
2United KingdomGB3
3United StatesUS3
4AustraliaAU1
5HondurasHN1
6JamaicaJM1
Total12