"rich terrain" is a correct and usable part of a sentence in written English.
For example, "The forest's rich terrain was full of diverse life."
I think it's rich terrain.
Psychologically this is very rich terrain for empirical investigation.
Rich terrain — and I've probably omitted a dozen or so others.
Federalism scholars, meanwhile, have barely engaged the increasingly rich terrain of joint immigration enforcement.
It is no wonder that even the humblest desktop rock provided rich terrain for imaginative journeying.
At the Serpentine, a series of Insomnia Labs will explore the rich terrain between creativity and sleeplessness.
On its approach to Ceres, Dawn's camera revealed a bright patch on the otherwise dark and dull, carbon-rich terrain.
The goal of his former allies is to combat climate change by harnessing the desert's solar-rich terrain, reducing the region's reliance on carbon-emitting fuels.
However, if mining firms want to take advantage of the most mineral-rich terrain in developing countries, they must engage with the communities living near projected mining operations.
"What is really exciting and interesting is the ability to reach very far into the neutron-rich terrain," says Konrad Gelbke of the National Superconducting Cyclotron Laboratory at Michigan State University.
Thermokarst lake development between 7.0 and 1.8 cal ka BP (unit C) was characterized by a dynamic equilibrium, where lake basin and talik steadily expanded into ambient ice-rich terrain through shoreline erosion.
