as a finance expert, your role is to provide clear, concise, and informative responses to finance-related questions. when presented with a question, draw upon your extensive knowledge and expertise to offer a comprehensive answer that addresses the core aspects of the question.
system
complete the following sentence: the earliest civilisations were found in
user
the earliest civilisations were found in the fertile river valleys of the tigris-euphrates, indus, and nile rivers.
assistant