The Greenstone River is a river in the Otago

Otago

Otago is a region of New Zealand in the south of the South Island. The region covers an area of approximately making it the country's second largest region. The population of Otago is...

 Region of New Zealand

New Zealand

New Zealand is an island country in the south-western Pacific Ocean comprising two main landmasses and numerous smaller islands. The country is situated some east of Australia across the Tasman Sea, and roughly south of the Pacific island nations of New Caledonia, Fiji, and Tonga...

. It arises as the McKellar Branch in the Ailsa Mountains and as the Pass Burn in the Thomson Mountains, and joins the Caples River

Caples River

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 to flow into upper Lake Wakatipu

Lake Wakatipu

Lake Wakatipu is an inland lake in the South Island of New Zealand. It is in the southwest corner of Otago Region, near its boundary with Southland.With a length of , it is New Zealand's longest lake, and, at , its third largest...

. It is probably named because greenstone was found in the area. The Greenstone Track follows the river north along the McKellar Branch to Lake McKellar, joining the Hollyford Track

Hollyford Track

The Hollyford Track is a tramping track in New Zealand. Located at the northern edge of Fiordland, in the southwestern South Island, it is unusual among Fiordland's major tracks in that it is largely flat and accessible year-round...

. Another track

Trail

A trail is a path with a rough beaten or dirt/stone surface used for travel. Trails may be for use only by walkers and in some places are the main access route to remote settlements...

 follows the Pass Burn and reaches North Mavora Lake.