Vertical caving terminology and methods > Pitches and potholes, general terms
The place where a pitch becomes vertical, or vertical enough that you would fall down it if you stepped there, or that water would start to fall if it were flowing there, at the pitch head. The lip is often too narrow to fit down, and a pitch head might include a traverse over the lip to reach the takeoff point. With a surface shaft, the lip circles the entire opening of the pitch.
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