Features in a landscape

3. a large valley with very steep sides and usually a river flowing along the bottom
6. the wide part of a river at the place where it joins the sea
7. an area of land covered with a thick growth of trees
8. an area of water smaller than a lake, often artificially made
12. a large area of water surrounded by land and not connected to the sea except by rivers or streams:
14. a natural wide flow of fresh water across the land into the sea, a lake, or another river
15. a tall plant that has a wooden trunk and branches that grow from its upper part
17. an area of land that is higher than the surrounding land

1. an area of sea water separated from the sea by a reef (a line of rocks and sand)
2. a large area of land covered with trees and plants, usually larger than a wood, or the trees and plants themselves
4. a raised part of the earth's surface, much larger than a hill, the top of which might be covered in snow
5. water that flows naturally along a fixed route formed by a channel cut into rock or ground, usually at ground level
9. an area, often covered with sand or rocks, where there is very little rain and not many plants
10. an area of low, flat land, sometimes shaped like a triangle, where a river divides into several smaller rivers before flowing into the sea
11. a large hole in the side of a hill, cliff, or mountain, or one that is underground
13. an area of sand or small stones near the sea or another area of water such as a lake
16. a high area of rock with a very steep side, often on a coast