Such stands of relatively untouched trees are meant as shelters for the rich array of plant and animal species, such as the tiger, that once spread throughout vast regions of tropical jungle. (scientificamerican.com)
But when outbreaks bring dozens of tornadoes over days, they can leave a path of death and destruction across vast regions. (discovermagazine.com)
The problem is they varied enormously over vast regions. (drtimball.com)