We had a very long coastline in the southwest that we shortened by closing estuaries after 1953. The Zuiderzee coastline was similarly shortened after the construction of the Afsluitdijk almost a century ago. Before that, there were many floodings of the old towns like Volendam, Hoord, ENkhuizen.
About half the country is below sea level, so some 100 km inland, or a bit more, depending on where you are. But even in supposedly high ground such as where we are, we are only about 1 meter above sea level. We are on a ridge that was pushed forward during the last ice age. A thousand years ago people north of us were living on little islands just above wetlands that were periodically flooded. When in the twelfth and thirteenth century European population started to grow people began to construct dikes to drain the land for cultivation. So we have a lot of small thirteenth century churches built bij these new communities. This reclamation came to a temporary halt when in the early fourteenth century the climate deteriorated, followed by the Black Death, the big yersinia pestis epdemic that killed about half the European population.
Reclamation has continued ever since, such as in the seventeenth century in the polders north of Amsterdam, using windmills, and financed by capitalist merchants from Amsterdam. One consequence of lowering the water table has been that the soil shrinks, so by pumping out the water we are continuously sinking. Land that was once above sea level no longer is. This will be the largest challenge when the sea level continues to rise. I am sure the same is happening in coastal Florida as well. I know from Dutch consulting engineers that this is happening in Indonesia's capital Djakarta at a very rapid rate.