The map below was purportedly acquired through an unnamed source, however it should be taken with a huge grain of salt. It could quite easily be fake.
Those familiar with the original Red Dead Redemption will notice that Blackwater seemingly makes a return in the lower left corner, which would mean that this games takes place east of where the previous game did. Furthermore, the anonymous source apparently also spoke to TechRadar and outed that this sequel will actually be a prequel.
This isn’t the first time news has floated around that RDR2 will be a prequel, plus there are rumours that an official announcement will be made at E3. Stick tuned.