Hills Park, to the north. The vegetation is described as dry sclerophyll (hard leafed) bushland on Sydney sandstone and is typical of the flora associated with the Northern Hills District of Sydney. The northwest, northeast and part of the southeast boundaries are delimited by unmade road reserves, Malton Road (part) and Lyne Road (also known as Cobram Road). It is located on a small ridge, formerly and unofficially called Native Rose Ridge, on the inside of a sharp curve in a creek draining the Beecroft Cheltenham area. This creek subsequently joins Devlins Creek. The upper parts of Ahimsa are relatively flat but the groundslopes off in a series of small Hawkesbury Sandstone cliffs in a north by north-west direction to the fire trail and towards Pennant Hills Park. There are many flat sandstone outcrops and small cliffs. Buildings The buildings include Ahimsa, The Hut of Happy Omen, the toilets, which were all built before the land was sold to the Trust, Sentosa, a detached bedsitter which was approved in principle in November 1975. A carport was built onto The Hut in 1977. Ahimsa is a small one-bedroom house built of unpainted fibro, oiled timber and random rubble with a pitched roof of glazed terracotta. There is a brick fireplace in the living room and a large north-facing open verandah looking over the gully. The Hut of Happy Omen is basically an open shed built of unpainted fibro with a roof of corrugated fibro. At some time it has been extended to incorporate a kitchenette and a shower stall. Sentosa is an open plan bedsitter also constructed of fibro with a skillion roof of corrugated fibro. Marie Byles' design principles are best expressed in this quotation from her: 'No Painting whatever anywhere - Any woodwork to be treated with linseed raw oil (saves unkeep): External walls are to be fibro; Corrugated (sic) fibro (long experience has shown fiber to be lasting, with no upkeep).' Paths were made by volunteers and Marie Byles' bushwalking friends. Condition As at 27 June 2000, the physical condition was good. Modifications and dates An absorption trench was constructed in 1975 to contain surface run off from properties adjacent to Ahimsa as the Trust was afraid that excessive run off would encourage weed growth. One cave has been altered and an attractive two-metre high Hawkesbury Sandstone retaining wall was constructed many years ago near the path from