Which civilization is characterized by a lack of defensive walls due to geographical location and dependence on the Nile river?

The Egyptian Civilization is notably characterized by its unique relationship with the Nile River, which played a crucial role in its development and daily life. The Nile provided not just water for irrigation and sustenance but also served as a natural highway for transportation and trade. Due to the fertility provided by the river's annual flooding, the Egyptians could cultivate surplus crops, which supported a stable and prosperous society.

Another significant aspect is the geographical setting of Egypt, surrounded by deserts which offered natural protection from invaders. The combination of these factors led to a reduced need for elaborate defensive walls, unlike many other ancient civilizations that faced constant threats and thus prioritized fortifications. The Egyptians focused more on monumental architecture and tomb construction, exemplified by the pyramids, representing their values and beliefs rather than fortifying their cities.

In contrast, other civilizations mentioned, such as the Roman, Greek, and Aegean, often found themselves in diverse and sometimes hostile environments, which necessitated the construction of walls and fortifications for defense against raids and warfare. The absence of significant defensive structures in Egyptian civilization is a testament to its unique ecological and social conditions, making it distinct in the context of ancient civilizations.