'Coastline' in the Bible

‘As for the western border, you shall have the Great Sea, that is, its coastline; this shall be your west border.

The west border was at the Great Sea, even its coastline. This is the border around the sons of Judah according to their families.

Ashdod, its towns and its villages; Gaza, its towns and its villages; as far as the brook of Egypt and the Great Sea, even its coastline.