The world-famous coastal cities include Barcelona, Sydney, Miami, China, Vancouver, and Shenzhen.

1. Barcelona, Spain

Barcelona is located in the northern Iberian Peninsula, near the Mediterranean Sea, and is the second largest city in Spain. Barcelona is a port city of Catalonia, a world-renowned Mediterranean scenic tourist destination, a world-famous historical and cultural city, and the most important trade, industry and financial base of Spain.

Barcelona, known as the "Pearl of Iberian Peninsula", is the most famous tourist destination in Spain with its pleasant climate, beautiful scenery and numerous historical sites.

2. Sydney, Australia

Sydney, the capital of New South Wales, Australia, is the center of Australia's economy, finance, transportation and tourism. It is the largest city and the second largest port in Oceania and the southern hemisphere, and a world-famous international metropolis. Sydney is the host city of many important international sports events. As an internationally famous tourist destination, Sydney is famous for its landmark buildings such as beaches, opera houses and Bay Bridge.

3. Miami, USA

Miami is the second largest city in Florida, located in Biscayne Bay, Florida Peninsula. It is one of the most densely populated cities in the United States, the largest metropolitan area in the southeastern United States and the fourth largest metropolitan area in the United States.

4. Vancouver, Canada

The City of Vancouver is a coastal city in the lowland plain area of British Columbia, Canada. According to the 2111 census, Vancouver has a population of 611,111, while Greater Vancouver has a population of 2.3 million, making it the third largest city in Canada and the largest city in western Canada.

5. Shenzhen, China

Shenzhen, also known as Pengcheng, is a municipality under the jurisdiction of Guangdong Province. It is located in the south of Guangdong Province, on the east bank of the Pearl River Delta, separated from Hong Kong by water, bordering Daya Bay and Dapeng Bay in the east, the Pearl River Estuary and Lingdingyang in the west, connecting Hong Kong with Shenzhen River in the south and Dongguan and Huizhou in the north.

Shenzhen has the largest number of entry and exit ports in China, and Shenzhen is also an important border port city.