Usually when shaving , there would be border to where you would stop. When I shave on this border more hair grows above it .It might carry on and on and eventually reach the navel
The area immediately under the navel is not to be shaven.
The area of shaving for a person (male / female) is above and around the private parts. If possible, it is commendable to shave around the hind private parts as well. (Al-Kamil, commentary of Muslim; Imam Nawawi vol.1 pg.128).
and Allah Ta’ala Knows Best
Mufti Ebrahim Desai