Hydrography is sometimes referred to as maritime cartography. In plain English, this refers to the process of making maps depicting bodies of water such as oceans or lakes.
The term is "representative sample." It is a subset of a population that accurately reflects the characteristics of the whole population it is meant to represent.
A landlocked country is a nation that does not have a coastline or access to open seas or oceans. These countries are surrounded by land and must rely on neighboring countries for trade and transportation through ports. Examples include countries like Switzerland, Bolivia, and Afghanistan.
There seems to be a typo in your question. However, if you meant "geography," it is the study of the Earth's physical features, climate, population, and the relationships between humans and their environment.
Another term for flatlands is "prairies."
The term is archipelago.
Correction: What is hydrographic datum? not "hydrography"
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