You decide it is either a natural or artifisial boundry......
Ohio River
prudhoe is an example of what kind of physical feature
waterfalls
it is Sea's
Bays
rivers
Its a divergent boundary
An island is a physical feature that is completely surrounded by water. A harbor, on the other hand, is a sheltered body of water where ships can anchor and dock.
convergent boundary.
convergent boundary
Convergent boundary
a transform boundary