Question: What is the name of the estuary surrounded by the delta containing Changzhou Island?

Context paragraphs:
Eendracht: The Eendracht is a former tidal branch of river Scheldt that has been channelised to form the northern stretch of the Scheldt-Rhine Canal.  It flows from the Zoommeer lake (formerly part of the Oosterschelde) near Bergen op Zoom past the town and eponymous island of Tholen towards the former island of Sint Philipsland, where it used to end in the Krabbenkreek estuary.  The passage to the estuary has been closed off, however, and an additional stretch of canal was dug to connect the Eendracht to the Krammer lake, itself a former estuary closed off from the sea during the Delta Works.  The Eendracht is probably the last remaining remnant of the Striene river.

Geography of Ireland: :Ireland is an island in Northwestern Europe in the north Atlantic Ocean.  The island lies on the European continental shelf, part of the Eurasian Plate.  The island's main geographical features include low central plains surrounded by coastal mountains.  The highest peak is Carrauntoohil (Irish: "Corrán Tuathail" ), which is 1041 meters above sea level.  The western coastline is rugged, with many islands, peninsulas, headlands and bays.  The island is bisected by the River Shannon, which at 360.5 km with a 102.1 km estuary is the longest river in Ireland and flows south from County Cavan in Ulster to meet the Atlantic just south of Limerick.  There are a number of sizeable lakes along Ireland's rivers, of which Lough Neagh is the largest.

Choate Island: Choate Island, also known as Hog Island, is an island located in the Essex River Estuary in Essex, Massachusetts.  It is part of the Crane Wildlife Refuge, which is owned and managed by The Trustees of Reservations.  The 135 acre island is a refuge for a variety of birds and animals.  It is surrounded by a salt marsh and has a spruce forest which was planted in the 1930s and makes the island easily visible from much of the surrounding area.  The island has been inhabited by the Native Americans of the area, and was visited by early Europeans, who established farming on the island.  The Choate House, built around 1730, remains relatively unchanged.

Meaher State Park: Meaher State Park is a publicly owned recreation area located on Big Island, an island at the north end of Mobile Bay that lies within the city limits of Spanish Fort, Alabama.  The state park occupies 1327 acre along the shoreline of Ducker Bay, at the junction of Mobile Bay and the Mobile-Tensaw River Delta.  It is surrounded by wetlands of the Mobile Bay estuary.  The park is accessed from Battleship Parkway, known locally as the "Causeway," and is managed by Alabama Department of Conservation and Natural Resources.

Pearl River Delta: The Pearl River Delta Metropolitan Region (PRD), also known as Zhujiang Delta or Zhusanjiao, is the low-lying area surrounding the Pearl River estuary, where the Pearl River flows into the South China Sea.  It is one of the most densely urbanized regions in the world and is an economic hub of China.  This region was also the source of much Chinese emigration from the 19th to the mid 20th centuries, including to the Western world, such as the US, Canada, Australia, Latin America, and much of Southeast Asia, where they formed many Chinatowns.  Today, much of the Chinese diaspora traces their ancestry to this region.

OML29: OML 29 is also known as Oil Mining Licence 29.  Oil Mining Licence OML is one of the two types of licences issued to oil producers in Nigeria "with validity periods ranging from 5 to 20 years respectively."  OML29 is a large block located in the southeastern Niger Delta containing 11 oil and gas fields.  OML29 stretches over an area of 983 square kilometres.  It includes the Nembe Oil Field, Santa Barbara Oil Field and Okoroba Oil Fields.  It also include related facilities like the Nembe Creek Trunk Line NCTL.  A 100 kilometres long pipeline with a capacity of 600 thousand barrels per day.

Cogo, Equatorial Guinea: Cogo (also known as Kogo or Koszho, formerly Puerto Iradier) is a remote town on the Muni estuary in Rio Muni, Equatorial Guinea, lying east of Acalayong.  It is known for its partly ruined Spanish Colonial architecture.  It is the southernmost city of the Littoral province of Equatorial Guinea.  It is located 121 km from Bata by road or 117 km when traveling through Acalayong.  It is surrounded to the east and southeast by the Congüe River and to the west and southwest by the Mitemle River.  Both the Congüe and the Mitemle Rivers drain the Muni Estuary, sometimes giving the city of Cogo the shape and appearance of an island when in fact it is a peninsuala.

Cross River (Nigeria): Cross River (native name: Oyono) is the main river in southeastern Nigeria and gives its name to Cross River State.  It originates in Cameroon, where it takes the name of the Manyu River.  Although not long by African standards its catchment has high rainfall and it becomes very wide.  Over its last 80 km to the sea its flows through swampy rainforest with numerous creeks and forms an inland delta near its confluence with the Calabar River, about 20 km wide and 50 km long between the cities of Oron on the west bank and Calabar, on the east bank, more than 30 km from the open sea.  The delta empties into a broad estuary which it shares with a few smaller rivers.  At its mouth in the Atlantic Ocean, the estuary is 24 km wide.  The eastern side of the estuary is in the neighbouring country of Cameroon.

Changzhou Island: Changzhou Island, formerly known in English as Dane or Dane's Island , is an island in the Pearl River Delta of China's Guangdong Province.  It is now administered as part of Guangzhou's Huangpu District, although the historic Huangpu Island was nearby Pazhou, which forms part of Haizhu District.

Estero Padre Ramos Natural Reserve: The Padre Ramos Estuary Natural Reserve (Spanish: "Reserva Natural Estero Padre Ramos") is located on the northwest Pacific coast of Nicaragua, in the municipality El Viejo in the department of Chinandega.  It is one of 78 protected areas of Nicaragua and is managed by Ministry of the Environment and Natural Resources (MARENA).  Estero Padre Ramos consists of a large mangrove estuary surrounded by several small beach communities, the largest of which is the town of Padre Ramos.  The area's natural environment is home to a number of species of migratory and resident birds, fishes, crustaceans, sea turtles and other wildlife.  While increasing in popularity as a tourist destination, tourism remains relatively well controlled in the area.

Supporting paragraphs: Changzhou Island Pearl River Delta
Answer: the Pearl River estuary