Answer:
Mountains
Explanation:
Mountains such as the Himalayas because they provide water to the rivers of the South East Asia, being able to the rice irrigation and protein to tens of millions of South East Asians in Thailand, Laos, Vietnam, etc.
Roman roads were a vital part of the development of the Roman state, from about 500 BC through the expansion during the Roman Republic and the Roman Empire. Roman roads enabled the Romans to move armies and trade goods and to communicate. The Romans became adept at constructing roads, which they called viae. Therefore advancing Rome greatly.
