What are some of the ways that the physical and natural environment put limits on the directions and locations of trade routes in premodern times? 150 words at least pls

In Pre modern times terrain was certainly insurmountable most of the time so it dictated trade.

Explanation:

Before the invention of cars or trains there was the issue of transportation throughout the world.

The terrain defined which areas  could get which resources and not the independent people of the region who would wish for something but could not have it because the place where that thing would be is across a mountain range.

This is the reason why ancient trade routes exist that were tried and tested and were known to be easy to walk on.

mount st. helens in washington erupts, causing a massive avalanche and killing 57 people on this day in 1980. ash from the volcanic eruption fell as far away as minnesota. seismic activity at mount st. helens, which is 96 miles south of seattle, began on march 16.

there were 6 major base camps.   the base camps were located in alva, fort reno, fort sill, the madill provisional internment camp headquarters, mcalester and camp gruber.