Since a large number of countries border the Pacific Ocean, it depends on which "pacific coast" you mean.
The pacific coast of the USA is its west coast.
The Rocky Mountains are the mountain range east of the Pacific coast in North America.
If you cross North or South America, you will find the Atlantic Ocean on the east coast.
The North Atlantic Ocean on the East coast, and the Pacific Ocean on the West coast.
The south American coast is farther east than the north American coast.
Guam is an island in the western part of the Pacific Ocean, south-southeast of Japan, east of the Philippines, and north of Australia and Papua New Guinea. It is not on either the east coast or the west coast of North America.
Atlantic borders the East coast of North America. Pacific borders the West Coast. Arctic borders the North coast.
Newcastle is located in south-east Australia on the Pacific Coast (which is the east coast).
On the east coast of the US there is the Atlantic Ocean and on the west coast there is the Pacific Ocean. The country with the most oceans surrounding it however is Canada it has the Atlantic Ocean on the east coast, the Pacific Ocean on the west coast, and the Arctic Ocean on the north coast.
the east coast of South America
The west coast of North and South America is where the Pacific Ocean is located. So for the USA located on North America, the Pacific Ocean is on the US West Coast. If you are in Australia, the Pacific ocean is on the eastern coast.
The East coastline of Australia is made up of Victoria's coast in the south then New South Wales and ending with the coast of Queensland in the north. the east coast looks onto the Pacific ocean also called the Tasman sea in this area.
On the East - the South Atlantic Ocean mainly - North East - the North Atlantic On the West - mainly the South Pacific , but again, on the North West, the North Pacific