Secret Passage from Whomping Willow

This map showed a set of passages he had never entered. And many of them seemed to lead - 'Right into Hogsmeade,' said Fred, traving one of them with his finger. 'There are seven in all. Now, Filch knows about these four -' he pointed them out, ' - but we're sure we're the only ones who know about these. We don't reckon anyone's ever used this one, because the Whomping Willow's planted right over the entrance.