| Missouri River |
a major river that flows from the state of Montana mostly southeast until it joins the Mississippi River in Missouri. The Missouri River is considered the longest river in the United States. It is the main tributary of the Mississippi River. |
| Mohawk |
an important river of New York State. It flows east from central New York toward the Atlantic. [2 definitions] |
| mouth |
the place where a river runs into a larger body of water. [1/6 definitions] |
| Murray River |
a river in southeastern Australia. |
| narrow |
(plural, but used with a singular or plural verb) a narrow part of a river or other body of water. [1/6 definitions] |
| Niagara Falls |
waterfalls on the Niagara River located on the border between the United States and Canada. The falls are divided into two principal sections by an island in the river. The two major sets of falls are the Horseshoe Falls, on the Canadian side, and the American Falls, on the U.S. side. The large and impressive falls are popular with sightseers. |
| Niger |
a river of west Africa. It flows from Guinea through Mali, Niger, and Nigeria into the Atlantic Ocean. [1/2 definitions] |
| Niger River |
a long river in western Africa that begins in Guinea and flows through Mali and Niger. It then flows along the border between Niger and Benin, through Nigeria, and finally into the Atlantic Ocean. It is an extremely important water source in the region. |
| Nile |
the longest river in the world. It flows north from Uganda in East Africa through Sudan and Egypt into the Mediterranean Sea. |
| Nile River |
an African river, generally considered to be the longest in the world, flowing from Uganda northward to the Mediterranean Sea. |
| Ohio |
a river of the eastern and central United States. It flows from Pennsylvania into the Mississippi River. [1/2 definitions] |
| Orinoco River |
a major river of South America that starts near the Venezuelan border with Brazil, flows across Venezuela, then along the border with Colombia, and finally empties into the Atlantic Ocean. |
| paddle wheel |
a wheel that has boards or paddles fixed at right angles around it. A paddle wheel is used to move a river steamboat. |
| palisade |
(plural) a long line of steep cliffs, along a river or coastline. [1/2 definitions] |
| Paraguay River |
a large river in South America that begins in southwestern Brazil, flows through Paraguay and along its border with Argentina. Finally, it joins the Paraná River at the southwestern tip of Paraguay. |
| Paraná River |
a major river in South America that starts in Brazil and flows mostly south. The Paraná River eventually joins a river called the Uruguay and empties into the Atlantic Ocean at the border between the countries of Argentina and Uruguay. |
| pool1 |
a deep place in a stream or river. [1/4 definitions] |
| Potomac |
a river of the eastern United States. It flows from West Virginia along the border of Washington, D.C., and into the Atlantic Ocean. |
| rapid |
(usually plural) a part of a river or stream where the water moves very quickly. [1/4 definitions] |
| rapids |
a fast-moving part of a river or stream that flows over rocks and can be difficult or dangerous to navigate through. |
| Rhine |
a river of Central Europe. It flows from Switzerland through Germany and the Netherlands to the North Sea. |