Sulphur flows are an important part of volcanic activity on Io, a moon of Jupiter, but are rare on earth.
Recorded sulphur flows on earth
Siretoko-Iosan (Japan),
Sierra Negra (Galapagos),
Azufre (Galapagos),
Mauna Loa (Hawaii),
Vulcano (Italy),
Lastarria (Chile),
Ijen (Indonesia).
Further reading
Naranjo, J.A., 1985. Sulphur flows at Lastarria volcano in the North Chilean Andes. Nature, 313(6005), pp.778-780.