横向
1
Line dividing two countries
3
Seasonal heavy rainfall
5
Where river meets the sea
7
Body of water surrounded by land
8
Landform where river meets the sea
纵向
2
Mountain that can erupt with lava
4
Largest river in South America
5
Goods sold to another country
6
Area where water covers the soil
9
Wearing away of land by water or wind