They can be 'navigated'
sea sickness/motion sickness
Japanese fishing boat
A house boat.
They are dried out rivers most scientists think. so you can call them rivers yes
You call it a shell
You call it a shell
Let's call it a U Boat. An undersea boat, a Submarine.
We can call them as Boat Builders.
The stern.
A Kayak
A canoe!
A snail-or!