Home / Articles / McCormick County and the Savannah River Parent Triangle McCormick County and the Savannah River Parent Triangle Edited by Avery Parker for South Carolina Genealogy · Article · Last reviewed August 19, 2026 · How we work & cite Published August 19, 2026 McCormick research is mostly a parent problem. Search Abbeville, Edgefield, and Greenwood, plus Savannah River corridor context. Watch reservoir-era community shifts for “vanished” addresses. Cheatsheet · Willington memory.