A sub-group of the Wallan Environment Group with a focus on the Hidden Valley area of Wallan.
Significant features include the Hidden Valley Bushland Reserve on Dolomite Rise, 45ha of remnant bushland with high conservation values and home to threatened species of plants and mammals.
Also the Hidden Valley Rail Reserve off Lucca Way. Native vegetation survived the rail era and has now recovered to create a lovely bushland reserve with many different trees and shrubs and a rich diversity of grasses and wildflowers. The old rail easement is providing great opportunities for botanists, walkers and cyclists.