how many miles of dikes protect the land of Holland?

Answer 1

http://www.worldatlas.com/webimage/countrys/europe/nl.htm
This classic home of Rembrandt, windmills and tulips, is in a constant battle with the sea to save its land. In that effort it uses 1,500 miles of dikes, a tidal barrage and additional innovative technologies.
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The link below includes all factors of protection from the seas..........
The link above is ONLY DIKES
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http://www.boston.com/news/world/europe/articles/2005/12/05/holland_goes_beyond_holding_back_the_tide/?page=3
They are protected by 2,174 miles of primary flood defenses, including dikes, pumping stations, dams, and enormous ''storm barriers" that rank among the wonders of the world; they are also aided by 8,699 miles of secondary defenses, such as canal dikes, basin dikes, holding ponds, and weirs.
None of the links include any part of
.....................the Antilles...........
https://www.cia.gov/cia/publications/factbook/geos/nt.html
Netherlands Antilles
(part of the Kingdom of the Netherlands)

Answer 2

They are protected by 2,174 miles of primary flood defenses, including dikes, pumping stations, dams, and enormous ''storm barriers" that rank among the wonders of the world; they are also aided by 8,699 miles of secondary defenses, such as canal dikes, basin dikes, holding ponds, and weirs.

Answer 3

Read last week Time Magazine ! (they had a detail discussion on the Holland's protective dikes)