Question: What body of water is near the towns of both Gaiman, Chubut and Trelew?

Context paragraphs:
Gaiman, Chubut: Gaiman is a town in the Chubut Province of Patagonia in Argentina.  It has a population of 4,730 as per the 2010 census .  It is located on the lower valley of the River Chubut (Welsh: "Dyffryn Camwy"), about 15 km west of Trelew.

Palaeospheniscus bilocular: Palaeospheniscus bilocular is a species of fossil penguins in the genus "Palaeospheniscus".  The species was named after two characteristic humeri (AMNH 3341 and 3346) (Simpson 1946) from the Early Miocene Gaiman Formation which were found near Gaiman in Chubut Province, Argentina.  It was the size of a small gentoo penguin.

Megunticook Lake: Megunticook Lake is a body of water in Knox County, Maine.  Parts of the lake are located in the towns of Camden, Hope and Lincolnville.  Covering 1,328 acres, it is the largest lake by both area and volume in Knox County.  Megunticook Lake is very picturesque with the towering cliffs of Mount Megunticook rising from the east shore.  The public can access the lake from improved boat ramps located off route 52 to the east and route 105 along the west shore.  The lake also serves as a public water supply for near by towns.

Ysgol yr Hendre: Ysgol yr Hendre ] is a Welsh/Spanish medium school in the large town of Trelew in Chubut Patagonia.  It was opened on Monday, 6 March 2006, initially to teach children between three and five years of age in Welsh and Spanish.  It is one of several active Welsh schools and nurseries.  The school was part of a 21st-century revival in Welsh in "the Welsh colony" Y Wladfa on the Chubut River (Camwy in Welsh).  In 2005 there were 62 Welsh classes in Chubut, and Welsh was on the curriculum of two primary schools and two colleges in the Gaiman catchment area.  The Chubut education authorities authorised the establishment of the school and supports its aims.

Golfo Nuevo: Golfo Nuevo is a body of water formed by the Península Valdés and Punta Ninfas in the province of Chubut in the Argentine Patagonia.  It is located 650 miles (1,046 km) southwest of Buenos Aires, Argentina.  Puerto Madryn is its major seaport.  From May to December, the Southern right whales migrate to Golfo Nuevo to breed.  Golfo Nuevo was also the scene of a series of mysterious submarine contacts in 1958 and 1960.

Trelew massacre: The Trelew Massacre was a mass execution of 16 political prisoners, militants of different Peronist and left organizations, in Rawson Penitentiary by the conservative military government of Argentina.  The prisoners were recaptured after an escape attempt and subsequently shot down by marines led by Lieutenant Commander Luis Emilio Sosa in a simulated new attempt to escape.  The marines forced the prisoners to fake a new escape, then executed them as revenge by the dictatorship for the successful escape of some of their comrades during the initial prison break.  The massacre took place on the morning of 22 August 1972 in the Almirante Marcos A. Zar Airport, an airbase of the Argentine Navy near the city of Trelew, Chubut in Patagonia.

Boca Toma Weir: Boca Toma, also called Boca de la Zanja, is a small weir on the Chubut River in Chubut Province, Argentina completed in 1919.  It is a wall that causes a steep drop in the river, allowing water to be diverted into irrigation canals.  Because the area has very low rainfall, this dam allows irrigation in the river valley.  The Boca Toma is located a few kilometers downstream from Dique Florentino Ameghino in Gaiman Department.

Florentino Ameghino Dam: The Florentino Ameghino Dam ("Dique Florentino Ameghino") is a gravity dam in Chubut Province, Patagonia, Argentina, 140 km west of the city of Trelew.  The dam also protects the towns in the lower Chubut River valley from flooding.

Trelew: Trelew (] , from Welsh: "tre" "town" and the name of the founder) is a city in the Chubut Province of Argentina.  Located in Patagonia, the city is the largest and most populous in the low valley of the Chubut River, with an estimated 100,000 inhabitants as of 2010.  The Trelew municipality is part of the Rawson Department, whose capital, Rawson, is also the provincial capital.

Dolavon: Dolavon (Welsh: "Dolafon") is a small town in the Patagonian province of Chubut, Argentina.  It has a population of 2,929 according to the 2001 census .  It is located close to the Chubut River, about 19 km to the west of Gaiman.  The name comes from Welsh "dôl" (meadow) and "afon" (river).  Welsh immigrants began to settle in the area after their arrival in Patagonia in 1865.  The Central Chubut Railway arrived in 1915, linking the settlement to Trelew, and the town was officially founded in 1919.  Dolavon became a centre of wheat production using irrigation canals to compensate for the arid climate.  The old flour mill with its water wheel is now a museum.

Supporting paragraphs: Gaiman, Chubut Trelew
Answer: Chubut River