Geologic History
The Curonian Spit was formed about 3rd millennium BC. A glacial moraine served as its foundation; winds and sea currents later contributed enough sand to raise and keep the formation above sea level.
The existence of this narrow shoal is inherently threatened by the natural processes that govern coastal shoreline features. It depends on a dynamic balance between sand transport and deposition. If (hypothetically) the source area to the south-west were cut off, say, by a large port construction with a pier, the Spit would erode and eventually disappear. It is thus a geologically speaking ephemeral coast element. The most likely development, however, is that the shallow bay inside the Spit will eventually fill up with sediment, thus creating new land.
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—David Hume (1711–1776)