Volcanoes RS
Rabaul, Papua New Guinea
Reunion Island (Piton de la Fournaise) - Indian Ocean
Reventador, Ecuador
Ruapehu, New Zealand
Sakura-jima, Japan
Sangay, Ecuador
Santa Maria, Guatemala
Santorini, Greece
Santorin Island, Greece
Semeru, Indonesia
Shasta, Cascades (USA)
Shishaldin, Alaska
Soufriere, Montserrat - Student Page
South Sandwich Islands
Stromboli, Italy
Sunset Crater National Monument, Arizona
Surtsey Island, Iceland