The sediments that formed the lake bottom make this one of the world's most productive agricultural regions.

Productivity has increased marginally, but is still low compared to highly productive regions.

The town is situated in a productive agricultural region.

On the other hand, although productivity of crops increased marginally, still these are much lower in comparison to highly productive regions.

Baden-Wurttembeurg is one of the most productive regions in Germany.

The surrounding area, especially to the south, is a productive agricultural region known as the Palouse.

It is a manufacturing, commercial, and transportation center located in a productive agricultural region.

Although this had been a richly productive region, by the early 20th century, there was a general economic collapse.

The Central Valley is one of the world's most productive agricultural regions.

The least productive regions will be abandoned first.