You Do Need power plug adapter while traveling from South Africa 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 Africa are C, M and N. This is how they look like.

South Africa

In South Africa, outlets of type C, M and N are in use.

Type C

Type M

Type N

Åland Islands

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

Type C

Type F