Bidjigal Reserve, managed by a community Trust, is about 186ha of bushland located within the Sydney suburbs of Castle Hill, West Pennant Hills, North Rocks and Baulkham Hills. There are many walking trails, and three marked tracks: Platypus loops along creeks from the entrance at Excelsior Ave; Burraga follows creeks and climbs Bald Hill from Platypus track, and the Murri Yanna begins at Aiken Road or Heidi pl and follows Darling Mills Creek to North Parramatta.