Just to give you a rough count of Iraqi riverine forces in Basrah Province.
- Iraqi Navy has the coast areas and the terminals.
- DBE Coastal Border Guards has 30 PBs and works the Shatt-al-Arab up to where the Tigris and Euphraties split.
- I do not have a count of boats in the 10th DBE Brigade but, they work the Hawar Marshes of north Basrah/south Maysan Provinces.
- 14th IA Div has an Assault Boat Company.
- And Basrah IP has a riverine SWAT Battalion.
That is just Basrah Province...
(The first Riverine units of the ISF were formed in Anbar, Baghdad, and Basrah Provinces starting in 2005.)