Natural accidents

3. a luxuriant, dense forest rich in biodiversity, found typically in tropical areas with consistenly heavy rainfall
4. a strip of land covered with sand, shingle, or small stones at the edge of a body of water, especially by the sea between high and low water marks
7. a piece of land surrounded by water
9. a low area of land between hills of mountains, typically with a river or stream flowing through it
11. a small river that flows on or below the surface of the ground
12. a large area of water surrounded by land

1. a large natural elevation of the earth´s surface rising abruptly from the surrounding level; a large steep hill
2. a very large expanse of sea, in particular each of the main areas into which the sea is divided geographically
5. an area of open land, especially one planted with crops or pasture, typically bounded by hedges or fences
6. a large natural stream of water flowing in a channel to the sea, alake, or another river
8. arid land with generally sparse vegetation
10. is a place where water flows over the edge of a steep, high cliff in hills or mountains, and falls into a pool below