Question: Lake Managua and Rush Lake, are an expanse of water entirely surrounded by land and unconnected to the sea?

Context articles: Lake Nicaragua
Rush Lake (Pakistan)
Lake Managua
Los Placeres
Tipitapa
Tipitapa River
Managua Department
Rush Lake (Tooele County, Utah)
Rush Lake, Wisconsin
La Chureca

Lake Nicaragua or Cocibolca or Granada (Spanish: "Lago de Nicaragua" , "Lago Cocibolca, Mar Dulce, Gran Lago, Gran Lago Dulce," or "Lago de Granada") is a freshwater lake in Nicaragua.
 Of tectonic origin and with an area of 8264 km2 , it is the largest lake in Central America, the 19th largest lake in the world (by area) and the 9th largest in the Americas, slightly smaller than Lake Titicaca.
 With an elevation of 32.7 m above sea level, the lake reaches a depth of 26 m .
 It is intermittently joined by the Tipitapa River to Lake Managua.
Rush Lake is a high altitude lake located in Nagar Valley, Gilgit-Baltistan, Pakistan near Rush Pari Peak, 5098 m .
 At 4,694 meters, Rush is one of the highest alpine lakes in the world.
 It is located about 15 km north of Miar Peak and Spantik (Golden Peak), which are in the Nagar valley.
 Rush Lake and Rush Peak can be reached via Nagar and Hopar and via the Hopar Glacier (Bualtar Glacier) and Miar Glacier, which rises from Miar and Phuparash peaks.
 The trek to Rush Lake provides spectacular views of Spantik, Malubiting, Miar Peak, Phuparash Peak and Ultar Sar.
Lake Managua (] ) (also known as Lake Xolotlán) (located at ) is a lake in Nicaragua.
 The Spanish name is Lago de Managua or Lago Xolotlán.
 At 1,042 km², it is approximately 65 km long and 25 km wide.
 Similarly to the name of Lake Nicaragua, its name was coined by the Spanish conquerors from "Mangue" (their name for the Mánkeme tribes) and "agua" ("water").
 The city of Managua, the capital of Nicaragua, lies on its southwestern shore.
Los Placeres is an archeological site located between the “Waspán” and “Tabacalera Nicaragüense” neighborhoods at kilometer 4½ of the “Carretera Norte”, in Managua, en Nicaragua.
 The site extends to the coast of Lake Managua.
 A large part of the area that delimits the site is being impacted by a new urban settlement known as Barrio Hugo Chávez, which divides the site, where its new settlers have disturbed the ground for installation of pipes for drinking water, toilet and housing, this activity has caused a serious incidental findings and impacts to the prehispanic archaeological site.
Tipitapa is a municipality in the Managua department of western Nicaragua.
 The area is located between Lake Managua and Lake Nicaragua.
The Tipitapa River (Río Tipitapa) is a short river in Nicaragua that connects Lake Managua to Lake Nicaragua.
 Its flow is seasonally variable and when Lake Managua, which is situated about ten meters higher than Lake Nicaragua, experiences high water levels (usually in the rainy season), the waters of the Tipitapa can rise, resulting in floods that affect bordering towns such as Tipitapa, which is situated on the river, near Lake Managua.
Managua (] ) is a department in Nicaragua.
 It covers an area of 3,672 km² and has a population of 1,380,300 (2005 census), making it the country's most populated department.
 The capital is the city of Managua, which is also the capital of Nicaragua.
 The department has two coastlines, on the Pacific Ocean and on Lake Managua, but does not border Lake Nicaragua.
Rush Lake (also known as Rush Reservoir) is a shallow saline lake in Tooele County in the U.S. state of Utah.
 It is a remnant of Lake Bonneville, an ancient postglacial inland sea that covered much of the western United States during the Ice Ages.
 The lake is a natural impoundment of a stream that drains into the Great Salt Lake.
 Rush Lake varies in size, evaporating at about 2 ft per year, although occasional floods refill the lake.
 The average surface elevation is 4951 ft .
Rush Lake is an unincorporated community located in the town of Nepeuskun, Winnebago County, Wisconsin, United States.
 Rush Lake is located at the junction of County Highway E and County Highway V 5.5 mi north of Ripon.
 Rush Lake is located to the east of the community, and the Mascoutin Valley State Trail runs through Rush Lake.
La Chureca (Spanish slang word for "city dump") was the municipal domestic and industrial waste-disposal site in Managua, Nicaragua.
 It was the largest open-air landfill in Central America, covering 7 km in the north-western corner of Managua.
 It is now covered and sealed, it is a modern waste dispose system which is located on the south shore of Lake Managua and it is near Acahualinca, home to the famous ancient footprints of Acahualinca.
 Out of the approximately 1,000 persons who reside at the dump, 50% are children under age 18.
 These children and families work at La Chureca sorting through the waste.
 Approximately 400 to 440 families live in La Chureca.