Boardwalk. A boardwalk is an elevated footpath, walkway, or causeway typically built with wooden planks, which functions as a type of low water bridge or small viaduct that enables pedestrians to better cross wet, muddy or marshy lands.
   Such timber trackways have existed since at least Neolithic times. Some wooden boardwalks have had sections replaced by concrete and even a type of recycled plastic that looks like wood.
   A typical nature boardwalk, carrying walkers over wetlands on the Milford Track, New Zealand An early example is the Sweet Track that Neolithic people built in the Somerset levels, England, around 6000 years ago. This track consisted mainly of planks of oak laid end-to-end, supported by crossed pegs of ash, oak, and lime, driven into the underlying peat.
   The Wittmoor bog trackway is the name given to each of two prehistoric plank roads, or boardwalks, trackway No. I being discovered in 1898 and trackway No. II in 1904 in the Wittmoor bog in northern Hamburg, Germany. The trackways date to the 4th and 7th century AD, both linked the eastern and western shores of the formerly inaccessible, swampy bog.
   A part of the older trackway No. II dating to the period of the Roman Empire is on display at the permanent exhibition of the Archaeological Museum Hamburg in Harburg borough, Hamburg. Australian soldiers walking along duckboards during the Battle of Passchendaele A duckboard i
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