| archipelago | a large group of islands |
| bay | a small area of ocean partly surrounded by land |
| port | the place where ships can load and unload;man-made |
| isthmus | a narrow strip of LAND connecting two larger land areas |
| volcano | a hill or mountain formed when melted rock is forced through the Earth's surface |
| sea level | the level of the surface of the ocean |
| channel | a narrow WATERWAY connecting two bodies of water; wider and deeper than a strait |
| swamp | low, wet land |
| delta | a rich soil deposit usually triangular in shape found at the mouth of a river |
| mouth | the place where a river ends |
| strait | a narrow WATER passage between 2 larger bodies of water |
| source | the place where a river begins |
| harbor | a shelterd area of deep water for ships to anchor;can be natural or man-made |