The Caples and Greenstone Valleys are linked by McKellar Saddle, a sub-alpine pass, to make a moderate 4- day round trip. It is a moderately demanding tramp with some days averaging 6-7 hours of walking. A reasonable degree of fitness is required.
The Greenstone Valley is a wide, open valley with tussock flats and beech forest. In comparison, the Caples Valley is a narrower valley filled with forest interspersed with grassy clearings. Either of these tracks can be linked with the Routeburn Track, or they can be walked as a one-way track starting or finishing either at the Divide or the Greenstone Shelter.
The superb diversity of natural features in this area is recognised internationally with the establishment of the Te Wāhipounamu-South West New Zealand World Heritage Area