i am not sure if i understand your question completely but i think the answer you are looking for would be a continent
A strip of land with large bodies of water on each side is a peninsula.
A narrow stripe of land that connects 2 large bodies of water is an isthmus.
A lake!
An isthmus.
It's an isthmus.
That would be an isthmus.
Continents, Islands
The large bodies of land are known as Continents; though most of them are joined together. The large bodies of water are Oceans, and they are all connected. The continents did not always have their present disposition, nor even their present areas.
isthmus
islands are pieces of land completely surrounded by water.
Land-locked countries
Water is generally slower than most solids to absorb or give up heat enery resulting a slower change of temperature. Thus large bodies of water tend moderate temperature of land masses. It follows that this effect will be less significant the further the land mass is from large bodies of water as the moderating effects will be reduced by heat transfer by areas of land closer to water and thus reduce the moderating effects of transfer of the medium through which it is carried, the air that travels from water to land.