Rotes Kliff

The Rotes Kliff is a around 30-metre high line of

sea cliff A cliffed coast, also called an abrasion coast, is a form of coast where the action of marine waves has formed steep cliffs that may or may not be precipitous. It contrasts with a flat or alluvial coast. Formation In coastal areas in whic ...

s between the villages of Wenningstedt and Kampen on the German

North Sea The North Sea lies between Great Britain, Denmark, Norway, Germany, the Netherlands, Belgium, and France. A sea on the European continental shelf, it connects to the Atlantic Ocean through the English Channel in the south and the Norwegian Se ...

island of

Sylt Sylt (; ; Söl'ring North Frisian: ) is an island in northern Germany, part of Nordfriesland district, Schleswig-Holstein, with a distinctively shaped shoreline. It belongs to the North Frisian Islands and is the largest island in North Fris ...

. It is located on the west side of the

island An island or isle is a piece of land, distinct from a continent, completely surrounded by water. There are continental islands, which were formed by being split from a continent by plate tectonics, and oceanic islands, which have never been ...

facing the open sea, beginning in the south at the car park of "Risgap" in Wenningstedt and ending in the north at ''Haus Kliffende'' on the Kampen West Heath. For centuries these striking cliffs have acted as an unmistakable recognition mark of the island for ships. Nowhere on the German and Dutch North Sea shores is there such a striking

cliffed coast A cliffed coast, also called an abrasion coast, is a form of coast where the action of marine waves has formed steep cliffs that may or may not be precipitous. It contrasts with a Flat coast, flat or alluvial coast. Formation In coastal ar ...

. About 120,000 years ago,

glacier A glacier (; or ) is a persistent body of dense ice, a form of rock, that is constantly moving downhill under its own weight. A glacier forms where the accumulation of snow exceeds its ablation over many years, often centuries. It acquires ...

s of the Saale glaciation deposited thick, unsorted

rock Rock most often refers to: * Rock (geology), a naturally occurring solid aggregate of minerals or mineraloids * Rock music, a genre of popular music Rock or Rocks may also refer to: Places United Kingdom * Rock, Caerphilly, a location in Wale ...

debris in the region of the present-day island of Sylt. As a result of rising

sea level Mean sea level (MSL, often shortened to sea level) is an mean, average surface level of one or more among Earth's coastal Body of water, bodies of water from which heights such as elevation may be measured. The global MSL is a type of vertical ...

s in the post-glacial period, these formed an abrasion coastline. The rusty-red

glacial till image:Geschiebemergel.JPG, Closeup of glacial till. Note that the larger grains (pebbles and gravel) in the till are completely surrounded by the matrix of finer material (silt and sand), and this characteristic, known as ''matrix support'', is d ...

, which gives the cliffs their name, is caused by colouration arising from the

oxidation Redox ( , , reduction–oxidation or oxidation–reduction) is a type of chemical reaction in which the oxidation states of the reactants change. Oxidation is the loss of electrons or an increase in the oxidation state, while reduction is ...

of ferrous elements. Even in the 19th century,

geologist A geologist is a scientist who studies the structure, composition, and History of Earth, history of Earth. Geologists incorporate techniques from physics, chemistry, biology, mathematics, and geography to perform research in the Field research, ...

s suspected there was a geological connexion between Sylt and

Heligoland Heligoland (; , ; Heligolandic Frisian: , , Mooring Frisian: , ) is a small archipelago in the North Sea. The islands were historically possessions of Denmark, then became possessions of the United Kingdom from 1807 to 1890. Since 1890, the ...

, whose

s have a similar coloration but are considerably older and have a different genesis. The rocks that break off the Rotes Kliff - such as

flint Flint, occasionally flintstone, is a sedimentary cryptocrystalline form of the mineral quartz, categorized as the variety of chert that occurs in chalk or marly limestone. Historically, flint was widely used to make stone tools and start ...

rhomb porphyry Porphyry ( ) is any of various granites or igneous rocks with coarse-grained crystals such as feldspar or quartz dispersed in a fine-grained silicate-rich, generally aphanitic matrix or groundmass. In its non-geologic, traditional use, the ...

or Rapakivi granite - still enable an accurate determination of their origin to be made. The Rotes Kliff has always been at great risk from

storm surge A storm surge, storm flood, tidal surge, or storm tide is a coastal flood or tsunami-like phenomenon of rising water commonly associated with low-pressure weather systems, such as cyclones. It is measured as the rise in water level above the ...

s and

erosion Erosion is the action of surface processes (such as Surface runoff, water flow or wind) that removes soil, Rock (geology), rock, or dissolved material from one location on the Earth's crust#Crust, Earth's crust and then sediment transport, tran ...

. Since the end of the 1970s, coastal defence measures have been taken, however, in the shape of extensive

sand replenishment Beach nourishment (also referred to as beach renourishment, beach replenishment, or sand replenishment) describes a process by which sediment, usually sand, lost through longshore drift or erosion is replaced from other sources. A wider beach c ...

of the entire west beach of the island and this has proved an important protection against the loss of land. However this has also resulted in the Rotes Kliff in the municipality of Wenningstedt becoming largely invisible from the sea, because it is now hidden behind beach grass-covered

sand dune A dune is a landform composed of wind- or water-driven sand. It typically takes the form of a mound, ridge, or hill. An area with dunes is called a dune system or a dune complex. A large dune complex is called a dune field, while broad, flat ...

s. File:Panorama vor dem Roten Kliff.jpg, Rotes Kliff, seen from the beach between Wenningstedt and Kampen {{Coord, 54, 57, 03, N, 8, 19, 27, E, type:landmark_region:DE-SH, display=title Nordfriesland Cliffs of Germany Landforms of Schleswig-Holstein