paragraph_text: Lågskär Lighthouse is an automated lighthouse located on the north side of Lågskär, one of Finland's Åland Islands in the Sea of Åland of the Baltic. It is the only striking feature on Lågskär on the generally uninhabited island.

paragraph_text: Null Island is a fictional island in the Gulf of Guinea added to the Natural Earth public domain map dataset, located where the equator crosses the prime meridian, at coordinates 0 ° N 0 ° E ﻿ / ﻿ 0 ° N 0 ° E ﻿ / 0; 0. Natural Earth describes the entity as a ``1 meter square island ''with`` scale rank 100, indicating it should never be shown in mapping.'' The name 'Null' refers to the two 0 co-ordinates, both of which are sometimes known as null in mathematics.

paragraph_text: Svartsö is an island located in the Stockholm archipelago in Värmdö Municipality in Sweden. In the summer the island is a popular destination for visitors. The landscape is relatively flat and there are several small lakes located on the island.

paragraph_text: The Mingan Archipelago National Park Reserve () is a national park reserve located in the eastern area of Quebec, Canada, on the north shore of Gulf of St. Lawrence. It features the Mingan Archipelago, a chain of around 40 islands.

paragraph_text: This is intended to be a complete list of the properties and districts on the National Register of Historic Places in Channel Islands National Park, California, United States. The locations of National Register properties and districts for which the latitude and longitude coordinates are included below, may be seen in a Google map.

paragraph_text: Pagoda Ridge () is a ridge with a small peak resembling a pagoda at the summit, located between Phobos Ridge and Deimos Ridge on the north side of Saturn Glacier, in southeast Alexander Island, Antarctica. The feature was mapped from trimetrogon air photography taken by the Ronne Antarctic Research Expedition, during 1947 and 1948, and from surveying by the Falkland Islands Dependencies Survey, 1948-50. This descriptive name was applied by the United Kingdom Antarctic Place-Names Committee.

paragraph_text: Atlantis Chaos is a region of chaos terrain in the Phaethontis quadrangle of Mars. It is located around 34.7° south latitude, and 177.6° west longitude. It is encompassed by the Atlantis basin. The region is across, and was named after an albedo feature at 30° S, 173° W.

paragraph_text: Hydraotes Chaos is a broken-up region in the Oxia Palus quadrangle of Mars, located at 0.8° North and 35.4° West. It is 417.5 km across and was named after a classical albedo feature name. More information and more examples of chaos regions can be found at Martian chaos terrain. The area contains small conical edifices, called Hydraotes Colles, which were interpreted as the Martian equivalent of terrestrial cinder cones formed by volcanic activity.

paragraph_text: Bearing Island (or also Direction Island) is a small antarctic island lying midway between Nansen Island and Enterprise Island in Wilhelmina Bay, off the west coast of Graham Land. Bearing Island is located at (). The name Bearing or Direction Island was used for this feature by whalers in the area because the island and a rock patch on Nansen Island were used as leading marks when entering Foyn Harbor from the southeast.

paragraph_text: Jacks Island is an alluvial island in the Allegheny River. Its southwestern half lies in the city of Lower Burrell, while its northeastern half lies in Allegheny Township, in Westmoreland County in the U.S. state of Pennsylvania. The island is situated across from Harrison Township in Allegheny County.

paragraph_text: Koll Rock, also known as Blake Island is a large rock located southeast of Oom Island in the west side of Oom Bay, Mac. Robertson Land, Antarctica. It was mapped by Norwegian cartographers from air photos taken by the Lars Christensen Expedition, 1936–37, and named "Kollskjer" (knoll rock).

paragraph_text: Turtletown is an unincorporated community in Polk County, Tennessee, United States. Turtletown is located on Tennessee State Route 68 north-northeast of Ducktown. Turtletown is in a primarily mountainous terrain, covered in forests except for areas cleared by farmers, ponds, or roads. Turtletown has a post office with ZIP code 37391. Turtletown's borders, however, in the eyes of some are disputed. According to one, parts of it are known as Dogtown, which appears on a few local maps. However, to others, it is simply all Turtletown and Dogtown does not exist. The only known map that contains this is the USGS map of the area, and a U.S. Forest Service map. There is an abandoned school, Turtletown School, across the street from the Post Office.

paragraph_text: Rodd Island is a island on the Parramatta River in Sydney, Australia. It lies in the centre of Iron Cove, between the suburbs of Drummoyne, Russell Lea, Rodd Point, Haberfield and Leichhardt. It is located west of the Sydney Harbour upstream and the Harbour Bridge. Today the island is uninhabited, and forms part of the Sydney Harbour National Park. The island has had various other names over its history: Rabbit Island, Rhode Island, Snake Island and Jack Island.

paragraph_text: Jack refuses the offer and escapes. He meets up with his father, Captain Teague, who warns Jack about the Fountain's rituals. Jack learns someone is impersonating him to recruit a crew to find the Fountain. The impostor is Angelica, Jack's former lover, and the daughter of the ruthless pirate Blackbeard, who practices voodoo magic and wields the mythical ``Sword of Triton ''that controls his ship, the Queen Anne's Revenge. While Jack is shanghaied aboard Blackbeard's ship, Gibbs escapes execution by memorizing and destroying Jack's map showing the Fountain's location, forcing Barbossa to take him along.

paragraph_text: Guest Peninsula is a snow-covered peninsula about long between the Sulzberger Ice Shelf and Block Bay, on Saunders Coast in the northwest part of Marie Byrd Land, Antarctica. Mitchell Peak, located on the peninsula, was sighted by the first Byrd Antarctic Expedition in 1929. This feature was defined and mapped as "Guest Island" by the United States Antarctic Service Expedition in 1940. It was determined to be a peninsula by U.S. Geological Survey cartographers from air photos taken by the U.S. Navy, 1962–65. It is named for Amy Guest, a contributor to the Second Byrd Antarctic Expedition, 1933-35.

paragraph_text: The Flatvaer Islands (, meaning "flat islands"), also known as the Ongul Islands, are a group of small islands lying at the east side of the entrance of Lützow-Holm Bay, 4 km from the coastline of Antarctica. They were mapped by Norwegian cartographers from air photos taken by the Lars Christensen Expedition (LCE), 1936–37. Many of the islands and their features were subsequently named by members of the Japanese Antarctic Research Expedition (JARE); unless otherwise noted, features noted in this article were named by JARE.

paragraph_text: The Royal Society Range () is a majestic mountain range in Victoria Land, Antarctica. With its summit at , the massive Mount Lister forms the highest point in this range. Mount Lister is located along the western shore of McMurdo Sound between the Koettlitz, Skelton and Ferrar glaciers. Other notable local terrain features include Allison Glacier, which descends from the west slopes of the Royal Society Range into Skelton Glacier.

paragraph_text: The Gannon Nunataks () are a notable twin-peaked group of nunataks (about high) and several smaller rock outcrops, located between the northern end of the LeMay Range and the Lully Foothills, situated in the west-central portion of Alexander Island (between Haydn Inlet and Schubert Inlet), Antarctica. The feature was photographed from the air by the Ronne Antarctic Research Expedition, 1947–48, and mapped from these photographs by D. Searle of the Falkland Islands Dependencies Survey, 1960. It was named in 1977 by the UK Antarctic Place-Names Committee for Anthony E. Gannon, a British Antarctic Survey meteorological observer at Halley Station, 1970–72, a general assistant at Grytviken, 1972, and a builder at Stonington Island, 1973–75, who participated in a plane-table survey of northern Alexander Island, 1973.

paragraph_text: In 1773 Bonne succeeded Jacques Nicolas Bellin as Royal Cartographer to France in the office of the Hydrographer at the Depôt de la Marine. Working in his official capacity, Bonne compiled some of the most detailed and accurate maps of the period. Bonne’s work represents an important step in the evolution of the cartographic ideology away from the decorative work of the 17th and early 18th century towards a more detail oriented and practical aesthetic. With regard to the rendering of terrain Bonne maps bear many stylistic similarities to those of his predecessor, Bellin. However, Bonne maps generally abandon such common 18th century decorative features such as hand coloring, elaborate decorative cartouches, and compass roses.

paragraph_text: The Allegheny River (/ ˌæləˈɡeɪni / AL - ə - GAY - nee) is a principal tributary of the Ohio River; it is located in the Eastern United States. The Allegheny River joins with the Monongahela River to form the Ohio River at the ``Point ''of Point State Park in Downtown Pittsburgh, Pennsylvania. The Allegheny River is, by volume, the main headstream of the Ohio River.

Question: Where is the river in which Jacks Island is found located on a map?
Answer: Eastern United States