Fournoi Korseon (Greek: Φούρνοι Κορσεών), more commonly simplified as Fournoi (Greek: Φούρνοι), anciently known as Corsiae or Korsiai (Ancient Greek: Κορσίαι), Corseae or Korseai (Κορσεαί), Corsia or Korsia (Κορσία), and Corassiae (Κορασσίαι), form a complex or archipelago of small Greek islands that lie between Ikaria, Samos and Patmos in Ikaria regional unit, North Aegean region. The two largest islands of the complex, the main isle of Fournoi 31 square kilometres (12 square miles) and the isle of Thymaina 10 square kilometres (3.9 square miles), are inhabited, as is Agios Minas Island 2.3 square kilometres (0.9 square miles) to the east. The municipality has an area of 45.247 km. On the main isle Fournoi (town) is the largest settlement and then Chrysomilia in the north the second largest (and third largest overall, after Thymaina). Fournoi (town) proper is the main ferry harbour, with ferries also landing on Thymaina.
Many of the inhabitants are fishermen, although during the summer season the population is also occupied in tourist activities, mostly room rentals and catering. On the main island are a number of beaches such as Vlychada, Vitsilia, Petrokopio, Elidaki, and Bali.