The harp has 47 strings grouped in pitch-classes: C, D, E, F, G, A, B. Each pitch class can be tuned flat, natural, or sharp by shifting a pedal.
The range is from C1 - G7, and there are distinct registers on the harp, as follows:

Central register:
Low register:
High register:

Click notes to hear the harp range:
Damped

Harp range damped

Undamped
Harp range damped