Question: Oosterend, in the Island municipality of Texel, is located in what sea?

Context paragraphs:
Bømlo (island): Bømlo (or Bømmeløy) is an island in Hordaland county, Norway.  At 171 km2 , it is the largest island in the island municipality Bømlo lying just off the western coast of Norway.  The island sits at the northern entrance to the vast Hardangerfjorden, west of the Stokksundet strait, south of the Selbjørnsfjorden, and east of the North Sea.  In the 1800s, the Kulleseid Canal was built across a small isthmus in the central part of the island, giving a shortcut from the eastern side of the island to the western side of the island.

Texel: Texel (] ) is a municipality and an island with a population of 13,641 in the province of North Holland in the Netherlands.  It is the largest and most populated island of the West Frisian Islands in the Wadden Sea.  The island is situated north of Den Helder, northeast of Noorderhaaks, also known as "Razende Bol" and southwest of Vlieland.

Tysnes: Tysnes is a municipality in Hordaland county, Norway.  It is located in the traditional district of Sunnhordland.  The administrative centre is the village of Uggdal.  Other population centres in Tysnes include the villages of Våge and Onarheim.  The island municipality is located in a group of islands near the mouth of the Hardangerfjorden.  The majority of the municipal population lives on the island of Tysnesøya, the largest island in the municipality.

Zuid Haffel: Zuid Haffel (South Haffel) is a polder and village in the northwest of the Netherlands.  It is located on the island of Texel, North Holland.  Texel is also the municipality of the place.

Utsira: Utsira is one of the smallest municipalities in Norway.  The island municipality is located in northwestern Rogaland county, just off the western coast of Norway.  Utsira is part of the traditional district of Haugaland.  Utsira is the smallest municipality of Norway by population and it is the second smallest municipality by area (after the nearby island municipality of Kvitsøy).

Finnøy (island): Finnøy is an island in Finnøy municipality in Rogaland county, Norway.  The 25 km2 island is one of the largest in the island municipality.  The administrative centre, Judaberg, is located on the eastern shore of the island.  The island is located on the southern side of the Boknafjorden, about 20 km northeast of the city of Stavanger.  The village of Hesby, on the western coast, is a historical seat of power dating back to the Middle Ages.  Hesby is also the site of Hesby Church which dates back to around the year 1100.

Sjernarøy: Sjernarøy is a former municipality in Rogaland county, Norway.  The island municipality existed from 1868 until its dissolution in 1965.  The municipality was located in the Boknafjorden in the present-day municipality of Finnøy.  The administrative centre of the municipality was located on the island of Kyrkjøy, where the Sjernarøy Church is located.

Dunes of Texel National Park: Dunes of Texel National Park (Dutch: "Nationaal Park Duinen van Texel" ) is a national park located on the North-Holland island of Texel in the Netherlands.  All dune systems on the western side of the island and the large coastal plains on both the northern and southern points of the island are part of the park.  The park covers approximately 43 km2 and attained national park status in 2002.  The visitor center is located in the natural history museum Ecomare.

Oosterend: Oosterend ( ) is a town in the Dutch province of North Holland.  It is a part of the municipality of Texel, and lies about 17 km northeast of Den Helder.

Kvitsøy: Kvitsøy is an island municipality in Rogaland county, Norway.  At only 6.29 km2 , it is the smallest municipality in Norway by area.  Kvitsøy is located in the traditional district of Ryfylke.  The administrative centre of the municipality is the village of Ydstebøhamn on the island of Kvitsøy.  The municipality is an archipelago located at the entrance to the large Boknafjorden.  It sits about 2 nmi northwest of the mainland Stavanger peninsula.  There are plans for the Rogfast tunnel to eventually connect Kvitsøy to the mainland road network.

Supporting paragraphs: Oosterend Texel
Answer: the Wadden Sea