This play is set in a couple of places. The play starts out in Athens where Hermia is supposed to be marrying Demetrius. She is trying to get out of doing this, but her father and also the prince of Athens say she has to.
Then, the play moves to the forest (presumably this forest is in Greece since they walk to it, but it sounds a lot like England). Most of the rest of the play happens in the forest where the fairies (Oberon, Titania and Puck) have a great deal of impact on what happens to the mortals who are running around in the woods.