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Where do the Frisian Islands extend along the North Sea coast?

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North Sea The North Sea, the Baltic Sea, and the English Channel.

The Frisian Islands form a low-lying chain that extends in an arc along the northern European mainland, situated 3 to 20 miles (5 to 32 km) offshore.1

The chain begins near the port of Den Helder in the northern Netherlands and runs eastward along the Dutch and German coasts as far as the Elbe River. From there, the islands turn sharply north, extending along the coast of Schleswig-Holstein (Germany) and the southern part of the Jutland Peninsula in Denmark, reaching as far as the island of Fanø near the Danish port of Esbjerg.12

The islands are traditionally subdivided into three groups:
* West Frisian Islands: Belonging to the Netherlands, extending from Texel eastward.1
* East Frisian Islands: Belonging to Germany, extending from the Ems River estuary to the Jade Channel.1
* North Frisian Islands: Divided between Germany and Denmark, running from north of the Elbe estuary to the Danish coast.31