Question: The river that powers the dam in Parana Brazil forms the boundary between what countries?

Context paragraphs:
Iran–Turkmenistan Friendship Dam: The Iran–Turkmenistan Friendship Dam (or Doosti Reservoir Dam) is a dam on the Hariroud River, which forms part of the international boundary between Iran and Turkmenistan.  The dam was completed in 2004, and both countries agreed that each would have an equal right to the waters of the river, which amount to 820 million cubic metres.  It was officially opened on 12 April 2005.  The dam provides drinking water and irrigation for the surrounding areas along with hydroelectric power.

Nagarjuna Sagar Dam: Nagarjuna Sagar Dam was built across the Krishna river at Nagarjuna Sagar where the river forms the boundary between Guntur District in Andhra Pradesh and Nalgonda District in Telangana states in India.  The construction duration of the dam was between the years of 1955 and 1967.  The dam created a water reservoir whose gross storage capacity is 11.472 e9m3 .  The dam is 490 ft tall from its deepest foundation and 1.6 km long with 26 flood gates which are 42 ft wide and 45 ft tall.

Seminoe Dam: Seminoe Dam is a concrete thick-arch dam on the North Platte River in the U.S. state of Wyoming.  The dam stores water for irrigation and hydroelectricity generation, and is owned and operated by the U.S. Bureau of Reclamation.  It is the uppermost dam on the North Platte River and is located directly upstream from the Kortes Dam.  It lies in a narrow, isolated canyon formed by the North Platte cutting through the Seminoe Mountains about 40 mi northeast of Rawlins.  The 295 ft dam forms Seminoe Reservoir, which covers more than 20000 acre when full.  Seminoe State Park is adjacent to the reservoir.  The small village of Seminoe Dam abuts the dam and reservoir, and provides residence for the dam attendants and park services personnel.

Little Tennessee River: The Little Tennessee River is a 135 mi tributary of the Tennessee River that flows through the Blue Ridge Mountains of Georgia, North Carolina, and Tennessee, in the southeastern United States.  It drains portions of three national forests— Chattahoochee, Nantahala, and Cherokee— and provides the southwestern boundary of the Great Smoky Mountains National Park.  The river flows through five major impoundments: Fontana Dam, Cheoah Dam, Calderwood Dam, Chilhowee Dam, and Tellico Dam, and one smaller impoundment, Porters Bend Dam.

Iguazu Falls: The Iguazu Falls, Iguazú Falls, Iguassu Falls, or Iguaçu Falls (Spanish: "Cataratas del Iguazú" ] ; Guarani: "Chororo Yguasu" ] ; Portuguese: "Cataratas do Iguaçu" ] ) are waterfalls of the Iguazu River on the border of the Argentine province of Misiones and the Brazilian state of Paraná.  They are the largest waterfalls system in the world.  The falls divide the river into the upper and lower Iguazu.  The Iguazu River rises near the city of Curitiba.  For most of its course, the river flows through Brazil; however, most of the falls are on the Argentine side.  Below its confluence with the San Antonio River, the Iguazu River forms the boundary between Argentina and Brazil.

Watts Bar Dam: Watts Bar Dam is a hydroelectric dam on the Tennessee River in Meigs and Rhea counties in Tennessee, United States.  The dam is one of nine dams on the main Tennessee River channel operated by the Tennessee Valley Authority, which built the dam in the early 1940s to provide flood control and electricity and to help create a continuous navigable channel along the entire length of the river.  The dam is the technical boundary between the 39090 acre Watts Bar Lake— which it impounds— and Chickamauga Lake, which stretches from the dam's tailwaters southward to Chattanooga.

Mancotal Dam: The Mancotal Dam is an embankment dam on the Tuma River near Asturias in Jinotega Department, Nicaragua.  It forms Lake Apanás, the largest reservoir in the country.  The primary purpose of the dam is hydroelectric power generation and it supports the 50 MW Centro América Plant.  The dam was completed and its first generator commissioned in 1964.  The second generator was commissioned a year later on 18 March 1965.  To generate power, water from the southwestern end of the Lake Apanás flows along a 4000 m long channel before it enters a series of headrace pipes and a penstock.  About 3.4 km to the south west the penstock meets Centro América Plant where it turns two 25 MW Francis turbines.  After generating power the water is then discharged into the Viejo River.  To supplement levels in the Lake Apanás, the El Dorado Dam was completed in 1985 and forms Lake Asturias just downstream of the Mancotal Dam.  Water from Lake Asturias can be pumped into Lake Apanás.  In 1998 heavy rains from Hurricane Mitch severely damaged the Mancotal and El Dorado Dams, over-topping their spillways and nearly destroying the dams.  The Virgen Dam downstream on the Viejo River was destroyed but later rebuilt.

Karcham Wangtoo Hydroelectric Plant: The Karcham Wangtoo Hydroelectric Plant is a 1000 MW run-of-the-river hydroelectric power station on the Sutlej River in Kinnaur district of Himachal Pradesh, India.  The dam and power station are located between the villages of Karcham and Wangtoo where the plant also gains its name.  Jaypee Karcham Hydro Corporation Limited of Jaypee Group signed a memorandum of understanding to develop the dam in 1993 and after years of delays, construction on the power station began on 18 November 2005.  In 2015 Jaypee Group sold out Karcham Wangtoo Project to JSW Group. The first generator was commissioned in May 2011, the second in June and the final two in September.  The 98 m tall dam at Karcham ( ) diverts a substantial portion of the Sutlej into a 10.48 m diameter and 17.2 km long headrace tunnel to the underground power station downstream at Wangtoo.  At the station, the water powers four 250 MW Francis turbine-generators before it is sent back into the Sutlej via a 1.2 km long tailrace tunnel.  The difference in elevation between the dam and the power station affords a gross hydraulic head of 298 m .  Water not diverted by the dam is sent over the spillway and down the normal course of the river.  The main spillway is along the crest of the dam and is controlled by six radial gates. Just upstream of the dam is the 300 MW Baspa II Hydroelectric Plant and downstream of the Karcham Wangtoo is the 1,500 MW Nathpa Jhakri Dam.

Bento Munhoz Hydroelectric Plant: The Governor Bento Munhoz da Rocha Netto Hydroelectric Plant, formerly known as Foz do Areia, is dam and hydroelectric power plant on the Iguazu River near Foz do Areia in Paraná, Brazil.  It is the furthest dam upstream of the Iguazu Falls and was constructed between 1976 and 1980.  The power station has a 1676 MW capacity and is supplied with water by a concrete face rock-fill embankment dam.

Griggs Dam: Griggs Dam is located within the Columbus, Ohio city limits, on the Scioto River near Upper Arlington, Ohio, in Franklin County.  The dam forms Griggs Reservoir, which is a major source of drinking water for the city of Columbus.  Named after the city's chief engineer, Julian Griggs, the dam was completed in 1905 at a cost of $700,000 and was the first major reservoir in the Columbus area.  For twenty years, it served as the only reservoir serving the city of Columbus' drinking water needs.  Griggs Dam is a gravity dam with a 500 ft curved concrete spillway.  Its height is only 35 ft , but it forms a reservoir almost 6 mi long with a 1200000000 usgal capacity.  US Route 33 runs along the East side of the dam, providing access to the dam and recreation area on both the upstream and downstream sides of the dam.

Supporting paragraphs: Bento Munhoz Hydroelectric Plant Iguazu Falls
Answer: Argentina and Brazil