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There are places to camp down by the river, and a very cool place would be near the confluence of the two Niles. You can take a bus out here. People will be curious, but rarely give you problems. Camping should be possible on Tuti Island, which is located between the White and the Blue Nileand accessibly by bridge. Most likely you will be locals there are extremely friendly and getting invited by locals to stay at there somebody's houseis fairly common.