The Yarra Ranges National Park encompasses the headwaters of the Yarra River and a large part of Melbourne's water catchment. Its boundaries stretch from Marysville, Healesville and Warburton to the river's source. The park's diverse terrain features picturesque snow gum forests, towering mountain ash (the world's tallest flowering plant), and rainforests with myrtle beech trees, fern gullies, and crystal-clear streams. The park is also home to several creeks that feed into the Yarra River. Lake Mountain Plateau (1530m), Lake Mountain summit (1433m) and Mt Donna Buang (1245m) boast sub-alpine vegetation and are regularly blanketed in snow during winter. The adjacent mountain ash forests, with their understoreys of tree ferns, are juxtaposed with cool temperate rainforests in the gullies. The rainforests house old-growth trees that can reach up to 80m tall and myrtle beech trees, some of which are between 300 to 600 years old.