Which parts of the body must be washed during istinja'? Does this include the pubic area, the labia, between the thighs, and the clitoris, or is it limited to the anal opening only? Is it sufficient to direct water only to the anal opening without it reaching the rest of these areas?

The woman's obligation in purification (istinja') from urine is to wash only what is visible of the vulva when she squats to relieve herself, unless the impurity extends beyond that. It is sufficient to direct the water hose directly to the area and rely on the force of the water, if the required purification, which is washing the visible part of the vulva, is achieved.