Why were the journals so important in the expedition?

The journals were vital to the expedition as they served as a detailed record of observations, discoveries, and experiences encountered along the journey. They provided insights into the geography, flora, fauna, and indigenous cultures, contributing to scientific knowledge and understanding of the region. Additionally, the journals helped document the challenges faced by the expedition, ensuring that valuable lessons and experiences were preserved for future reference. Overall, they were a key tool for both communication and historical record-keeping.