adjacent land

[masterding]

Quotes from VOA news
"If you look at the total amount of water going into river basins and the total amount of food coming out of river basins, the conversion ratio is pretty small, pretty low. And certainly in the African basins it was often 10 percent or even less of capacity. So, there immediately you can see that there's a huge potential to actually satisfy future food demands without necessarily compromising even more scarce water supplies," he said.
The river basin is much more than just the channel of water and adjacent land. Cook said the whole landscape should be included.
My question is :
1.what does" adjeacent land " mean ?
2. As far as I know" landscape" has meaning of "scenery", but it doesn't seem right in the news, so what does it mean here?
thanks.

[JohnParis]

The river basin is much more than just the channel of water and the land next to it.
Cook said the whole area surrounding the river basin should be included.

Hope this helps,
John