Cave Stream Scenic Reserve is a stunning park situated in Castle Hill basin in Canterbury, New Zealand. It features an incredible 594-metre limestone cave that provides a unique and wet adventure filled with fascinating formations like solution holes, rillenkarren and sculptured rock formations. Visitors are recommended to bring at least two torches and spare batteries, warm clothing and sturdy shoes. Inside the cave, hikers may ascend a rung ladder which leads to the final waterfall, allowing them to exit from the other end of the cave.