A barrier reef.
corals
Since parts of the east and west coasts of the US are roughly parallel, something parallel to one of them would be parallel to the other. The Appalachians are closer to the east coast than the west.
Long ridges of sand parallel to the shore are known as sandbars. They are formed by the action of waves and currents depositing sand in shallow areas along the coast. Sandbars can shift and change shape over time due to the movement of water.
The great barrier reef of corals.
The coast ranges
The Wash
They live in the West Coast in shallow waters
Because the fish probably hide in the corals when they hear a signal.
fringing reefs
The Cascade Range runs parallel to the west coast of the U.S., starting in northern California and extending through Oregon and Washington. The Sierra Nevada mountains are also located parallel to the west coast further inland, mostly in California.
because they can't form near the coast because of the different plates
It hit in the shallow waters about 80 miles from the coast of Japan.