Mae’n darparu ar gyfer creu 16 o etholaethau’r Senedd ar gyfer etholiad 2026, drwy baru’r 32 o etholaethau newydd Senedd y DU yng Nghymru mewn adolygiad annibynnol. Mae hefyd yn darparu ar gyfer cynnal adolygiad ffiniau llawn cyn etholiad dilynol y Senedd i greu 16 o etholaethau newydd yng Nghymru o etholiad 2030 ymlaen ac adolygiadau cyfnodol wedi hynny.
It provides for the creation of 16 Senedd constituencies for the 2026 election, through the pairing of the 32 new UK Parliament constituencies in Wales in an independent review.  It also provides for a full boundary review to be undertaken ahead of the subsequent Senedd election to create 16 new Welsh constituencies from the 2030 election onwards and periodic reviews thereafter.