The Rhine, The Danube, and the Elbe rivers
Rocky mountains
One have to travel through different countries across Europe like Germany, Austria and Bulgaria before finally reaching Istanbul.
The marched straight across the border to France as well as through Belgium and the Netherlands.
It can travel across the vacuum of space.
Historically, the answer would have been because of the way the Zagros Mountains cut across the Iranian heartland. Today, Iran has a complex train and highway network that links the north and south, making travel much less difficult.
Yes, a US citizen can travel to Germany.
why was travel across the Sahara desert difficult
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The big red spot, which is a giant hurricane in Jupiter's atmosphere and has been going for hundreds of years. If you could travel across the great red spot, it would take your whole life to do so.
Latvia is part of Schengen Agreement, just as Germany is. So YES, you can travel to Germany on a Latvian Visa.
A mountain range can make travel or transporting goods difficult due to the challenging terrain, narrow paths, and inclement weather conditions.
Transverse waves will move across the direction of travel.