They mostly come from the fertile Rift Valley of Kenya, the breadbasket of the country, putting more pressure on already skyrocketing food prices.

CNN: Displaced Kenya farmers add to food woes

Port-au-Prince might be cut off from the Artibonite Valley, the country's most fertile rice-producing region.

ECONOMIST: Two centuries of misery, continued | The

The annual loss of millionaires from the Bay Area--home to Silicon Valley--knocks this extremely rich and fertile place down near the bottom of the new millionaire list, putting it in the company of Detroit, Pittsburgh and Cleveland.

FORBES: Magazine Article

Moments from the single-track road that winds up the valley, Buchi unearthed a fresh cluster of blossoming wild garlic growing on the moist, fertile banks of the river Cwm Einion.

BBC: The wild taste of Wales

Michael Petraglia says that in the past, the spot must have been a lush river valley: "There is a major valley across the area which once was a river running westward forming waterfalls and taking water to the low fertile lands west of Al-Magar, " he explains.

BBC: Desert finds challenge horse taming ideas