Power trail
From GeoWiki
A power trail is a series of caches hidden along a trail at semi-regular intervals.
They are most often used as a way to highlight an area, dedicate a series or to increase ones hide / find count with minimal effort.
See this thread Groundspeak Forum Thread
There are a number of power trails in Australia.
- Blue Mountains in NSW
- Woodlands in Victoria
- Wandering Heroes in South Australia