Question: The River Ancholme in Lincolnshire in the east of England ends in which estuary?

full_context: Document 1: Hibaldstow Bridge: Hibaldstow Bridge is an iron arch bridge that spans the River Ancholme, near the villages of Hibaldstow, in North Lincolnshire, and North Kelsey, in the West Lindsey district of Lincolnshire. A plaque mounted in the centre of the bridge reads "Erected By JTB Porter & Co. 1889 Lincoln".
Document 2: Horkstow Bridge: Horkstow Bridge is a suspension bridge that spans the New River Ancholme near the village of Horkstow in North Lincolnshire. It was designed by Sir John Rennie as part of the River Ancholme Drainage Scheme, completed in 1836, and is a Grade II* listed building.
Document 3: Hales Island (Massachusetts): Hale's Island is a 54 acre island located on the Merrimack River in Haverhill / Bradford, Massachusetts. The property is part of Silsby's farm. Although there is not much there now, the island has reportedly been home to a golf course, a hotel, and even a small airport. The golf course was destroyed in 1936 when the island flooded. There is still the remnants of a foundation on the island. This was the foundation of the golf course club house. There are also four artesian wells on the island. Other than that, the island is mostly inhabited by snakes, bugs, and some birds. It is becoming increasingly overgrown these days. There is a stone bridge that connects it to land on the Bradford side. This can barely be seen when the water is low, and impossible when the water is high. The bridge was mostly destroyed in the 1936 flood that destroyed the golf course. The bridge was built to allow cows to move back and forth to the island for grazing. The island is not listed as an airport on any aeronautical charts. More than likely, that reference is to the area of the River on the north side of the island which was listed for landing seaplanes, and connected to an airfield which was previously located on Coffin Rd where there is now a marina.
Document 4: Read's Island: Read's Island is an island situated just outside the Ancholme sluice, on the Humber Estuary in England. The Lincolnshire Trust suggest it is an artificial island, and a report from 1979 says that it was reclaimed. However, the site was for many years a large sandbank going by the name of "Old Warp" and is shown on the 1734 Customs Map of the Humber where Read's Island now lays, and extending further downstream.
Document 5: Horkstow: Horkstow is a village and civil parish in North Lincolnshire, England, 4 mi south-west from Barton-Upon-Humber, 1 mi south from South Ferriby and 9 mi north from Brigg. It lies on the B1204, and 1 mi east from the navigable River Ancholme. It is one of the five "Low Villages" - Worlaby, Bonby, Saxby All Saints, Horkstow and South Ferriby - between Brigg and the River Humber, so-called because of their position below the northern edge of the Lincolnshire Wolds. Horkstow was previously part of South Humberside administrative district, and before that, the North Lindsey division of Lindsey, Lincolnshire.
Document 6: Tiber Island (District of Columbia): Tiber Island was a man-made island in Washington, D.C. formed when the Washington City Canal was dug to connect the stream beds of Tiber Creek and James Creek, creating an island out of an existing peninsula southwest of the Capitol. The canals have since been filled in, rejoining the island to the mainland. The Southwest Waterfront, Buzzard Point, National Mall, and L'Enfant Plaza areas were once on the island; at that time, their isolation from "the mainland" led to the area's colloquial nickname as "The Island."
Document 7: River Freshney: The River Freshney is a river in the English county of North East Lincolnshire. The town of Grimsby stands on its banks. It rises from at least four springs on the edge of the Lincolnshire Wolds, although local folklore and oral tradition has it springing from Welbeck Hill. Originally it entered the tidal River Humber at Pyewipe, north west of Grimsby, but has been re-routed and now supplies Grimsby Docks.
Document 8: Hog Island (Virginia): Hog Island is one of the Virginia Barrier Islands located southeast of Exmore in Northampton County, Virginia, and is a part of the Virginia Coast Reserve of The Nature Conservancy. The island, then known as Machipongo Island was first settled in 1672 by a group of 22 English colonists. The island was later abandoned and remained uninhabited until around the time of the American Revolution when it was resettled. In the late 1800's, at least five lavish hunting and fishing clubs that primarily catered to wealthy sportsmen from the Northeast were established on Virginia's barrier islands; one of the largest was in the town of Broadwater, Virginia, on Hog Island. Founded in the mid-19th century the town was located in a pine forest two miles from the ocean in the center of the island. In the 1930s when rapid beach erosion caused by several hurricanes that flooded the entire island made its continued existence untenable, many of the houses and other buildings in the town of Broadwater were floated by barge to the mainland and still stand in the towns Willis Wharf, Virginia and Oyster, Virginia today.
Document 9: Pulau Busing: Pulau Busing is an island located off the southwestern coast of Singapore, north of Pulau Hantu and west of Pulau Bukom. The island is owned by the JTC Corporation and is leased to Tankstore Ltd, a petroleum storage company. The land area of 4.4 hectares before reclamation has seen major land reclamation to its southern shores. Heavily industrialised, the island is home to oil and chemical storage facilities, at least one marine offshore terminal, and a fuel oil refinery. Together with Jurong Island and neighouring offshore islands, the island is part of the integrated storage and trading hub that was developed by Jurong Town Corporation. Pulau Busing is an important feeding and roosting ground for migratory shore birds. It appears as Po Busing in Franklin & Jackson's 1828 Plan of Singapore. 'Pulau' is Malay for island or an isolated piece of rising ground in a sea, and 'busing' comes perhaps from the Malay terms 'busung pasir' or 'busong pasir', which means a mound of sand or a dune, and pusing which means a turning point. Pulau Busing is strategically located next to the shipping channel and is naturally endowed with a deep waterfront harbour of deeper than 16 metres. Before reclamation, Pulau Busing had a land area of 4.4 hectares. Up to the 1980s, it was still fringed by coral reefs on its northern and southern shores.
Document 10: River Rase: The River Rase is 16 mile (25km) long tributary of the River Ancholme that flows through Lincolnshire, in the east of England.
Document 11: River Ancholme: The River Ancholme is a river in Lincolnshire, England, and a tributary of the Humber.
Document 12: Great Captain Island: Great Captain Island, also known more familiarly as "Great Captain's Island," is an island off the coast of Greenwich, Connecticut. The 17.2 acre island is the largest of a three-island group that also includes Little Captain and Wee Captain. The island is a remnant of a glacial moraine and has a large glacial erratic on the southern side, the island's east and west sides are connected by a tombolo. The island has had several owners, but has been owned in whole by the Town of Greenwich since 1973. The island is home to the Great Captain Island Light, a 19th-century lighthouse that was restored in 2009 and relit as a non-navigational aid in 2012. The actual navigation aid is a skeletal tower erected in 1970. Great Captain Island is one of the state's 26 "important bird areas" according to the Connecticut Audubon Society. The town operates a ferry service to and from the island from about the second week in June through the second week of September. Trails have been laid out for visitors, and the western part of the island has picnic tables, grills, restrooms, and posted swimming areas. The island is open year round, with a ferry running during the summer. No public tours of the lighthouse or island are available.
Document 13: Ferriby Sluice: Ferriby Sluice is a hamlet situated near the lock complex on the Humber and River Ancholme, Lincolnshire, England.
Document 14: Barrow Island, Barrow-in-Furness: Barrow Island is an area and electoral ward of Barrow-in-Furness, Cumbria, England. Originally separate from the British mainland, land reclamation in the 1860s saw the northern fringes of the island connect to Central Barrow. Barrow Island is also bound to the south and east by the town's dock system and to the west by Walney Channel. The Ward population taken at the 2011 census was 2,616.
Document 15: Mud Islands Game Reserve: Mud Islands Game Reserve is a protected area in South Australia covering ten islands at the southern side of Lake Alexandrina about 19 km south-east of Goolwa. The game reserve is described as providing ‘an ideal habitat for water birds, particularly waterfowl’ and that ‘duck shooting is permitted during open season.’ The game reserve is classified as an IUCN Category VI protected area. Since 2000, the game reserve has been located within the boundaries of the gazetted locality, Coorong.
ground_truth: Humber Estuary