Question: What is this intertidal zone in the southeastern part of the North Sea whose mudflat region is shielded by The Frisian Islands from the North Sea?

Context paragraphs:
German Bight: The German Bight (German: "Deutsche Bucht" ; Danish: "tyske bugt" ; Dutch: "Duitse bocht" ; West Frisian: "Dútske bocht" ; sometimes also the German Bay) is the southeastern bight of the North Sea bounded by the Netherlands and Germany to the south, and Denmark and Germany to the east (the Jutland peninsula).  To the north and west it is limited by the Dogger Bank.  The Bight contains the Frisian and Danish Islands.  The Wadden Sea is approximately ten to twelve kilometres wide at the location of the German Bight.  The Frisian islands and the nearby coastal areas are collectively known as Frisia.  The southern portion of the bight is also known as the Heligoland Bight.  Between 1949 and 1956 the BBC Sea Area Forecast (Shipping Forecast) used "Heligoland" as the designation for the area now referred to as German Bight.

Littoral zone: The littoral zone is the part of a sea, lake or river that is close to the shore.  In coastal environments the littoral zone extends from the high water mark, which is rarely inundated, to shoreline areas that are permanently submerged.  It always includes this intertidal zone and is often used to mean the same as the intertidal zone.  However, the meaning of "littoral zone" can extend well beyond the intertidal zone.

Frisian Islands: The Frisian Islands, also known as the Wadden Islands or Wadden Sea Islands, form an archipelago at the eastern edge of the North Sea in northwestern Europe, stretching from the northwest 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.

Föhr: Föhr    ("Fering" North Frisian: "Feer"; Danish: "Før" ) is one of the North Frisian Islands on the German coast of the North Sea.  It is part of the Nordfriesland district in the federal state of Schleswig-Holstein.  Föhr is the second-largest North Sea island of Germany and a popular destination for tourists.  A town and eleven distinct municipalities are located on the island.  The climate is oceanic with moderate winters and relatively cool summers.

Porphyra: Porphyra is a coldwater seaweed that grows in cold, shallow seawater.  More specifically, it belongs to red algae phylum of laver species, comprising approximately 70 species.  It grows in the intertidal zone, typically between the upper intertidal zone and the splash zone in cold waters of temperate oceans.  In East Asia, it is used to produce the sea vegetable products "nori" (in Japan) and "gim" (in Korea).  There are considered to be 60 to 70 species of "Porphyra" worldwide and seven in the British Isles.

List of ferry boats of the East Frisian Islands: The list of the ferries of the East Frisian Islands contains the ferries currently serving the islands of Borkum, Juist, Norderney, Baltrum, Langeoog, Spiekeroog and Wangerooge.  The East Frisian Islands, located between the Wadden Sea and the North Sea in Germany, have been inhabited for centuries by people and have long been a popular holiday region in East Friesland.  Traditionally, these ferries serve to transport people and goods, and are a most important link between the mainland and island ports.

East Frisian Islands: The East Frisian Islands (German: "Ostfriesische Inseln", West Frisian: "Eastfryske eilannen") are a chain of islands in the North Sea, off the coast of East Frisia in Lower Saxony, Germany.  The islands extend for some 90 km from west to east between the mouths of the Ems and Jade / Weser rivers and lie about 3.5 to 10 km offshore.  Between the islands and the mainland are extensive mudflats, known locally as "Watten", which form part of the Wadden Sea.  In front of the islands are Germany's territorial waters, which occupy a much larger area than the islands themselves.  The islands, the surrounding mudflats and the territorial waters (The "Küstenmeer vor den ostfriesischen Inseln" nature reserve) form a close ecological relationship.  The island group makes up about 5% of the Lower Saxony Wadden Sea National Park.

West Frisian Islands: The West Frisian Islands (Dutch: "Waddeneilanden" ; West Frisian: "Waadeilannen" ) are a chain of islands in the North Sea off the Dutch coast, along the edge of the Wadden Sea.  They continue further east as the German East Frisian Islands and are part of the Frisian Islands.

Marine iguana: The marine iguana ("Amblyrhynchus cristatus"), also known as the Galápagos marine iguana, is a species of iguana found only on the Galápagos Islands (Ecuador) that has the ability, unique among modern lizards, to forage in the sea, making it a marine reptile.  This iguana feeds almost exclusively on algae and large males dive to find this food source, while females and smaller males feed during low tide in the intertidal zone.  They mainly live in colonies on rocky shores where they warm after visiting the relatively cold water or intertidal zone, but can also be seen in marshes, mangrove and beaches.

Wadden Sea: The Wadden Sea (Dutch: "Waddenzee" , German: "Wattenmeer" , Low German: "Wattensee" or "Waddenzee ", Danish: "Vadehavet" , , North Frisian: "di Heef" ) is an intertidal zone in the southeastern part of the North Sea.  It lies between the coast of northwestern continental Europe and the range of Frisian Islands, forming a shallow body of water with tidal flats and wetlands.  It is rich in biological diversity.  In 2009, the Dutch and German parts of the Wadden Sea were inscribed on UNESCO's World Heritage List and the Danish part was added in June 2014.

Supporting paragraphs: Frisian Islands Wadden Sea
Answer: Wadden Sea