You Do Need power plug adapter while traveling from Marshall Islands to Mauritania.

Here is Why You Need An Adapter

The outlet and plug type used in Mauritania is C and in Marshall Islands are A and B. This is how they look like.

In Marshall Islands, outlets of type A and B are in use.

Type A

Type B

In Mauritania, outlets of type C are in use.

Type C

I am from

going to