The NWA Southeastern Heavyweight Championship or Gulf Coast Heavyweight Championship was one of two identically named regional championship titles, a Southern and Northern division promoted by Southeast Championship Wrestling. The Southern division was established in 1978 as a continuation of the NWA Gulf Coast Heavyweight Championship and existed until its merge with the Northern division in 1980. The unified championship continued to be active until 1988 when it was abandoned.
References
NWA Southeastern Heavyweight Championship Wikipedia(Text) CC BY-SA