The towns of Petersburg, Lisbon, and Vienna were located on the Savannah River at its confluence with the Broad River.  Petersburg and Vienna were on the Georgia side, and Vienna was across the Savannah in South Carolina.
Resources:
Blog Post
Plan of Petersburg
Old Petersburg report
Moses Waddel
Augusta Canal

Willington

Carolina Ghost Towns is an exploration of the lost towns and communities in South Carolina, North Carolina, and occasionally Georgia