You Do Need power plug adapter while traveling from Åland Islands to Czech Republic.

Here is Why You Need An Adapter

The outlet and plug type used in Czech Republic are C and E and in Åland Islands are C and F. This is how they look like.

Åland Islands

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

Type C

Type F

Czech Republic

In Czech Republic, outlets of type C and E are in use.

Type C

Type E