Does this city have seacoast?

Hello,

          May I ask whether this sentences sound natural for native speakers or not? "Does Philadelphia have seacoast?"

"The USA shares the northern border with canada."

"This river makes the border between these two cities."

         Thank you very much.

Hi! Your first sentence is correct, but it would sound more natural to say "Is Philadelphia on the ocean?"

The second sentence would sound better if you said, "Canada borders the USA to the North."

The third sentence looks good.

Amy