You Do Need power plug adapter while traveling from Gabon to Dominican Republic.

Here is Why You Need An Adapter

The outlet and plug type used in Dominican Republic are A, B and C and in Gabon is C. This is how they look like.

Gabon

In Gabon, outlets of type C are in use.

Type C

Dominican Republic

In Dominican Republic, outlets of type A, B and C are in use.

Type A

Type B

Type C