Tir Nan Og

The Enchanted Realm, using the White Circle, which is the only key to the realm of the Earth fairies. Loosely based on Tír na nÓg from Irish folklore.

Queen Morgana: Former Queen of the Earth Fairies, Rick's wife and Roxy's mother. After the Winx freed the Earth fairies she led the Earth fairies' revenge against the Wizards of the Black Circle for imprisoning them, and against the humans for stopping to believe in them and for damaging nature. At the end, she abdicated her Earth fairy throne and went to live with her husband and daughter in Gardenia.

Queen Nebula: Was one of the majorly powerful terrestrial fairies trapped within the mystical White Circle and Morgana's second in command. She used to be the fairy of peace, but was turned into the fairy of war by her intense rage and vengeance against both humans and the Fairy Hunters. At the end of the fourth season she finally lets go of her anger and becomes the new Queen of the Earth fairies after Morgana abdicates. 

Diana: The major fairy of nature. She lives in the Amazon Forest with the Amazon fairies.

Aurora: The major Earth fairy of the North. She lives in a floating ice palace called the Ice Tower. She possesses incredibly powerful cryokinetic abilities over ice, hail, frost, and snow. Her followers are the Arctic fairies.

Sibylla: The fairy of justice. She escaped from Tir Nan Og and she lives in a cave located in the Sibillini Mountains in Italy, named after her, along with her followers, the Rustic fairies.