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Snow Highlighting Chain of Frisian Islands, Netherlands and Germany – February 12th, 2013

53.3N 5.3E

February 12th, 2013 Category: Image of the day

Holland- January 25th, 2013

Snow covers Belgium, the Netherlands and Germany in this winter image of Europe. It also highlights part of the chain of Frisian Islands, also known as the Wadden Islands or Wadden Sea Islands. The islands form an archipelago at the eastern edge of the North Sea in northwestern Europe, stretching from the north-west of the Netherlands through Germany to the west of Denmark. The islands shield the mudflat region of the Wadden Sea (large parts of which fall dry during low tide) from the North Sea.

West Frisian Islands and Bodies of Water in the Netherlands

53.0N 5.4E

December 20th, 2010 Category: Lakes, Rivers

The Netherlands - December 19th, 2010

This APM image shows the West Frisian Islands, a chain of islands in the North Sea off the coast of the Netherlands. The body of water located between the islands and the mainland is called the Wadden Sea, an area of mudflats.

In the full image, two large lakes known as the IJsselmeer and the Markermeer can be observed to the south, in the central part of the full image, connected to the Wadden Sea. Below these lakes, in the bottom section, are three rivers flowing more or less horizontally across the image: the Lek River, Waal River and Maas River.

West Frisian Islands Separating Wadden and North Seas, the Netherlands

53.0N 5.1E

December 10th, 2010 Category: Lakes

The Netherlands - December 8th, 2010

This orthorectified image shows the West Frisian Islands, a chain of islands in the North Sea off the Dutch coast. They belong to the Kingdom of the Netherlands.

The islands shield the mudflat region of the Wadden Sea (between the islands and the mainland), large parts of which fall dry during low tide, from the North Sea (above and left). Two other bodies of waters connected to the Wadden Sea can be observed here: the IJsselmeer and the Markermeer.

The IJsselmeer appears various shades of grey and black, and is partially frozen. The Markermeer, connected to the IJsselmeer and best observed at the bottom of the full image, also appears partially frozen. Both lakes are shallow, the former about 5 to 6 meters in depth and the latter about 3 to 5 meters in depth.

Frisian Islands Chain and Dikes in the Netherlands

May 13th, 2009 Category: Snapshots

The Netherlands - May 12th, 2009

The Netherlands - May 12th, 2009

The West Frisian Islands, in a chain off the coast of the Netherlands, separate the North Sea from the Wadden Sea, an intertidal zone between the continental coast and the islands.

While the North Sea is deeper and appears dark navy blue here, the Wadden Sea has a greenish brown color, as it is a shallow body of water with tidal flats and wetlands rich in biological diversity.

The biggest and most populated of the Frisian Islands is called Texel. It is also the westernmost of this archipelago, and forms the largest natural barrier between the two seas. The dune landscape on Texel is a unique habitat for wildlife.

Below Texel and the Wadden Sea is a body of water formerly known as the  Zuiderzee. After being closed off from the North Sea by a dike, it was separated into two lakes: the IJsselmeer and the Markermeer, which are in turn separated by another dike called the Houtribdijk.

These dikes are visible in the full image as lines where the color of the water changes abruptly from dark brown (Wadden Sea), to dark green (IJsselmeer) to bright green (Markermeer).

The West Frisian Islands and the Houtribdijk, Holland – February 2nd, 2009

February 2nd, 2009 Category: Image of the day

Holland (The Netherlands) - January 30th, 2009

Holland (The Netherlands) - January 30th, 2009

The West Frisian Islands are a chain of islands in the North Sea off the Dutch coast. The islands visible here belong to Holland (the Netherlands); however, the chain continues further east as the German East Frisian Islands.

From west to east the islands are: Noorderhaaks, Texel, Vlieland, Richel, Griend, Terschelling, Ameland, Rif, Engelsmanplaat and Schiermonnikoog. The ones obscured by clouds, continuing to the East, are:  Simonszand, Rottumerplaat, Rottumeroog and Zuiderduintjes.

The Frisian Islands are nowadays mostly famous as a holiday destination. Ferries allow tourists and residents to move from island to island.

Below the islands is what was formerly known as the Zuiderzee, a shallow inlet of the North Sea in the northwest of the Netherlands.

In the 20th century, however, the majority of the Zuiderzee was closed off from the North Sea (leaving the mouth of the inlet to become part of the Wadden Sea) and the salt water inlet changed into a fresh water lake called the IJsselmeer.

The water in the inlet contains a dark green algal bloom that appears more intense in the souther section. This is because the lower part is actually a shallow lake called the Markermeer.

The Markermeer and the IJsselmeer are separated by a dike called the Houtribdijk. It is 30 kilometers long and connects the cities of Lelystad and Enkhuizen. The structure itself is not visible in the image, but it’s precise location can be identified as the line where the algae changes from bright green to dark greenish-black.