GEOGRAPHY 101 07:14 24 Mar 2003 seems convinced that the Marines are advancing up the Tigris.

Meanwhile, a Marine force, following the Tigris River toward Baghdad, reportedly was bogged down after encountering stiff resistance to the south, near the city of Nasiriyah.

Anyone looking at a map can see that An Nasiriyah is along the Euphrates, just over the river in the Euphrates-Tigris valley. MSNBC TV also thinks the Marines are following the Tigris toward Baghdad, but that the 3rd Infantry Division did the fighting in An Nasiriyah.