they build very strong dykes or levees and use proper drainage into theur estuaries
The Netherlands. Or Holland as many people call it. Holland is really a province in The Netherlands.
It's about 50% percent below the sea level!
Most parts of the Netherlands are below sea level / below the water level of the rivers that flow through the country. If there were no dams and dykes, those lands would be flooded.
The country that is mostly below sea level is the Netherlands. About 26% of the country's land is below sea level, with its lowest point reaching 22 feet below sea level. The Dutch have built an extensive system of dams, levees, and pumps to protect their land from flooding.
it is one of the smallest countries on the planet, below sea level with a population of roughly 18 million people.
The Netherlands
The answer is the Netherlands (Holland).
That would be the Netherlands.
1 meter below, behind the dunes and after that just like 10 cm above.
The Netherlands
All of the Netherlands lies below sea-level
About a third of the country is below sea level. This is indeed a very unique physical feature.