You Do Need power plug adapter while traveling from South Sudan to Åland Islands.

Here is Why You Need An Adapter

The outlet and plug type used in Åland Islands are C and F and in South Sudan are C and D. This is how they look like.

South Sudan

In South Sudan, outlets of type C and D are in use.

Type C

Type D

Åland Islands

In Åland Islands, outlets of type C and F are in use.

Type C

Type F