Conversation so far:
In what city did the Chimu expand their territory?
The Chimu territory developed in the Moche Valley north of present-day Lima and later expanded to Arequipa. To the south, they expanded as far as Carabayallo.
What sort of terrain did the Chimu live on?
The Chimú resided on a strip of desert on the northern coast of Peru. The rivers in the region carved a series of fertile valley plains well-suited to irrigation.

Question: Was it difficult for them to find food?
Self-contained rewrite: Was it difficult for the Chimu to find food?