What two conditions must exist for an artesian well to form?

The   two  condition  that  must  exist  for  an   artesian well  to  form  include  the following
1.Presence   of  water  which  must  be aquifer  that  is  tilted
2.There  must  be  aquitards  in  both  above  and  below  the  aquifer
     Artesian  involve,relate  or  supplied  by  the  upward  movement  of  water  under  hydrostatic  pressure  in  rocks.In  this  well  water  is   under  pressure  especially  when  water  flows  to   the  surface  naturally.

i didn’t understand your question but archipelagos are groups of island hope this