In some areas of the Nile, the fishing is great. However, the best area has two problems. One, every enemy we have knows about it. Two, the area is so rocky that farming is useless, and you can't find other animals to hunt.
I need you to go there and get control over that part of the Nile. You should be able to bring back a large quantity of Food if you control the water.
This, coupled with the sparse wood and mediocre quest rewards makes this map one to simply avoid. However, if you want a true challenge that is many time more difficult than any of the "Challenge" quests built into the game, proceed to the Player Guides page -- May Anubis have mercy on your soul.