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?

Mountains or anything that blocks a pathway is hard to travel. For example in Greece there are a lot of mountains so it is hard to open trade routes on the road.

Explanation:

the proximity of water was an advantage to western europe and its culture was able to flourish as a result. trade and travel by sea were easier and safer in historical times.

1. there are no mountains to protect it from the sea

2. and its has wet cool summers and wet, mild winters.

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