The land next to the sea is called the "Shore".
A sea breeze.
We call this "elevation".
Amphibian
sea breeze and land breeze
land lubber
Island
Land reclaimed from the sea is often referred to as reclamation land or land reclamation. It involves altering coastlines or waterways to create new land for various purposes such as urban development or agriculture.
bay
in the Netherlands we call reclaimed land "polders"
It is called Flevoland, the 12th province.
They would be considered Land-Locked
Straight