Large conservation area stretching across all three towns. Named after Cedar Hill, an easily hikeable small hill with views of the surrounding area. Access is a bit tricky since Cedar Hill doesn't have an address. You will find an access point off Lyman St in Westborough north of Route 9. Once you reach Westborough State Hospital, look out for a dirt road branching off across a field. At the end of the road is a parking area and a sign indicating that you are in the right place.