Dragonfly but which one?

Dragonfly but which one?

Observation - Dragonfly but which one? - Global. Description: I'm stuck on this one. Just back from Portugal south coast and this looks obvious but I can't find it in my list of dragonflies. Can anyone help, please? Thank you!

I'm stuck on this one. Just back from Portugal south coast and this looks obvious but I can't find it in my list of dragonflies. Can anyone help, please?
Thank you!