Canyoning (known in the U.S. as canyoneering) involves travelling down creeks or streams within a canyon by a variety of means including walking, scrambling, climbing, abseiling, swimming and "li-loing" (using an inflatable air mattress). It requires navigation, ropework, climbing, and general outdoor skills. Typically what separates a canyon from any ordinary stream is the narrow passage created by erosion into bedrock, creating beautiful sculptured walls and spectacular waterfalls. .