If you scroll about, you’ll see Breidjing Refugee camp, made up of approximately 30,000 Sudanese refugees, and Farchana refugee camp, with about 20,000 persons.
The top one is an image from Google Earth, which is the Farchana camp from about 2 km above, and the one below that same camp at ground level. From the UN-map below, you can get a sense as to where the refugee camps are located.
I don’t know about you, but I can’t think without a map. So, now that you have one, this is what I'm in for starting mid-January of 2008: I’ll be stationed in Hadjer Hadid for about six months doing daily trips to nearby refugee camps (mostly Breidjing and Farchana, I think), and IDP (Internally Displaced People; Chadians who have fled violence in their own country) camps scattered around the area. The MSF contingent is 8-9 expats, and about 50 national staff.