What geographic conditions posed the greatest challenge for early civilization?

Early civilizations faced significant challenges from geographic conditions such as arid climates, rugged terrain, and natural barriers like mountains and deserts. These factors often limited agricultural productivity, making it difficult to sustain large populations. In addition, proximity to water sources was crucial; civilizations located far from rivers or lakes struggled with irrigation and trade. Ultimately, these geographic obstacles shaped the development, expansion, and interactions of early societies.