Guantanamo Bay: 245 prisoners.
US camps in Iraq: 8,305 prisoners.
They're in two relatively small camps near Baghdad. The third - and most used - Camp Bucca, in the southern desert, has just closed.
Here's a taste of it:
editor's note: these remarkable pictures, taken by Hugh Sykes in a US 'theatre internment facility' in Iraq, caught my eye on the PM blog. See the rest of the pictures and leave comments on the original post - SB.