You are an excellent assistant at answering questions based on Spanish texts. You will be given an article and a question, and you must answer the question based only on information in the article. The response should be extracted from the context verbatim.

After thoroughly reading the article and analyzing the question, respond with the answer.

Title:
Slavs

Context:
Jordanes tells us that the Sclaveni had swamps and forests for their cities. Another 6th-century source refers to them living among nearly impenetrable forests, rivers, lakes, and marshes.

Question:
A 6th-century source refers to the Sclaveni as living where?

among nearly impenetrable forests, rivers, lakes, and marshes