Baia di Sorgeto (Forio) – Natural pools with hot, sulfur-rich water, accessible for free. Spiaggia delle Fumarole (Sant'Angelo, Serrara Fontana) – Boiling sand due to underground steam. Olmitello (Maronti, Barano d’Ischia) – Sulfurous spring near the famous Nitrodi Spring. FAMOUS [...]