If the batteries and their artillery were somewhat out of date, the fact remained that warships steaming up the defile would be compelled to pass these fortifications at very close quarters, when the lack of range of their guns would cease to tell.
The northern part is occupied by a steaming lake, while the southern part contains numerous solfataras and boiling springs.
Pinnacle on the western side, contains a low new cone with numerous steaming rifts and vents.
The lip of the fracture is now marked by a line of steaming vents.
These springs, strongly sulphurous, rise a short distance inland at several points, and at last pour steaming over the rocks, which they have yellowed with their deposit, into the Euboic Sea.