A coastline is not an area.
A coastline is a "line". Lines do not have an area they have length.
The ocean which borders Australia's western coastline is the Indian Ocean.The arm of the Indian Ocean that touches the northern part of Western Australia is the Timor Sea.
Indian ocean
Maharashtra
yes
The Indian Ocean borders Australia's western coastline.
yes
It is one, but not the same thing. An area can be anywhere & coastline is along the beach.
The Indian Ocean
It is 7500 kilometers long.
Bangladesh is a country located on the Indian Ocean. So the country's coastline is on the Indian Ocean.
The coastline from the Tanzanian border to the Somalian border is at sea level.