Rhyngddynt, mae ddau borthladd rhydd yn gobeithio creu rhyw 20,000 o swyddi erbyn 2030 a denu hyd at £4.9 biliwn o arian cyhoeddus a phreifat.
The two freeports aim to collectively create around 20,000 jobs by 2030 and attract up to £4.9 billion in public and private investments.