Where exactly are these Junk]Trash etc folders stored?

These folders are stored somewhere .. but where?

mailbox Trash {

auto = no

special_use = \Trash

}

mailbox Drafts {

auto = no

special_use = \Drafts

}

mailbox Sent {

auto = subscribe # autocreate and autosubscribe the Sent mailbox

special_use = \Sent

}

mailbox "Sent Messages" {

auto = no

special_use = \Sent

}

mailbox Spam {

auto = create # autocreate Spam, but don't autosubscribe

special_use = \Junk

}

mailbox virtual/All { # if you have a virtual "All messages" mailbox

auto = no

special_use = \All

}