| A | B |
| channel | narrow body of water connecting two larger bodies of water; deepest part of waterway |
| drainage basin | an area of land drained by a river & tributaries |
| inlet | small part of body of water that reaches into a coast |
| megalopolis | group of cities that have grown so close togethre they seem to form one city |
| ocean | large body of slat water; oceans cover much of Earth's surface |
| lock | a cosed section of a canal in which water can be raised or lowered |
| river | stream of water that flows across the land; empties into another body of water |
| tributary | smaller river that flows into a larger river |
| valley | low land between hills or mountains |
| island | body of land completely surrounded by water |
| Washington, D.C. | name created for city of Washington; it is not part of any state |
| elevation | height above sea level |
| Chesapeake Bay | largest inlet in US;home to 3,600+ species of plants, fish, etc. |