Most of the land within the ACE Basin is protected either through conservation easement, wildlife refuge, federal ownership, or whatever. The eponymous rivers are the Ashepoo River (middle), Combahee River (southernmost), and Edisto River (northernmost).
While not within the ACE Basin, this map includes the upper reaches of the three rivers and their tributaries. Until I visit all of these landings, I'm sure that mistakes abound.
I've explored dozens of islands, old rice fields, and creeks within the ACE Basin. There are endless paddling opportunities from forests and swamps to marshes and the ocean.
For more information, search Google or visit these sites:
ACE Basin
Ernest F. Hollings ACE Basin NWR
ACE Basin Reserve, South Carolina