Explanation

Starting from what we do know: even with today's more numerous and better roads and bridges, the woods and the river Meuse form a significant

This piece odf the statement clearly suggests you that the subject (in this case the Ardenne forest) is difficult to going through. So, we do need 3 words that suggest this overall.

The first one is impenetrable: difficult to enter in to the forest.

An unpropitious, which means a NON favorable, unpleasant place.

Actually, we do have today impediment to pass by, yet
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