There are many cities that are not near the sea, but you don't mention in which country you are talking about.
As an island nation, everywhere is close to the sea. It is hard to get more than 100 km from the coast. However, most of the available flat land is near the sea and cities tend to be built where there are good rivers (water supply) and ports (transportation and trade). Elsewhere in the world, you will find most cities near the sea, but there are some exceptions (land-locked countries or other available resources.)
Cities in the Sea - 2002 was released on: USA: 3 January 2002 (video premiere)
Several large cities are located near the Yellow Sea, including Beijing and Tianjin in China, as well as Incheon and Busan in South Korea. These cities are significant economic and cultural hubs in their respective countries. The Yellow Sea serves as an important maritime route for trade and transportation, further enhancing the prominence of these urban centers.
Most of Ireland's cities are on or very near the coast, giving them access to the sea. This is important for importing and exporting. Some also have sea transport, such as ferries.
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Because in older times trade was done via boats therefore the bigger trade cities had to be near rivers so the boats could come up the rivers from the sea.
all the cities near sea level. (I assume you meant 15 psi).
A part of a country or landmass that is adjacent to the sea.
My source indicates that this adjective has 5definitions:1. connected with the sea in relation to shipping, navigation, etc.2. of or pertaining to the sea, as in maritime resources.3. bordering along the sea, as in maritime provinces or maritime cities.4. living near or in the sea, as in maritime plants.5. characteristic of a sailor; nautical, as in maritime clothing.
Kiel There are several notable port cities in Germany that are on or near the Baltic Sea, but Kiel is the largest and most profitable.
Examples: Marseille, Cannes, Nice.
Rats can live anywhere, including on boats