横向
1
Chain or group of islands
6
Large natural stream of water
8
Where river meets the sea
9
Cold treeless Arctic plain
12
Large body of water partly enclosed by land
13
Largest river in South America
纵向
2
Vast body of salt water
3
Wearing away of land by water or wind
4
Piece of land jutting into the sea
5
Physical features of land
7
Land surrounded by water
10
Raised area of land, smaller than a mountain
11
Large area covered with trees