In Mount Hypipamee National Park a huge, vertical diatreme (volcanic pipe) formed when a vent exploded violently and created a sheer-sided crater. The gaping hole is 70 metres wide with steep granite sides that plunge 58 metres to the lake below. The lake itself is 82 metres deep! The park protects unique high-altitude rainforest and is World Heritage listed. Picnic in the rainforest then walk 350 metres to the viewing deck over the diatreme. Return along the one kilometre Dinner Falls track. Look for golden bowerbirds, spotted catbirds and riflebirds. Go spotlighting to see green, lemuroid and Herbert River ringtail possums, and long-nosed bandicoots.