You Do Need power plug adapter while traveling from French Guiana to Syria.

Here is Why You Need An Adapter

The outlet and plug type used in Syria are C, E and L and in French Guiana are C, D and E. This is how they look like.

French Guiana

In French Guiana, outlets of type C, D and E are in use.

Type C

Type D

Type E

Syria

In Syria, outlets of type C, E and L are in use.

Type C

Type E

Type L