It arises as the McKellar Branch in the Ailsa Mountains and as the Pass Burn in the Thomson Mountains, and joins the Caples River to flow into upper Lake Wakatipu.

[1] It is probably named because greenstone was found in the area.

[2] The Greenstone Track follows the river north along the McKellar Branch to Lake McKellar, joining the Hollyford Track.

[3] Another track follows the Pass Burn and reaches North Mavora Lake.

This article about a river in the Otago region is a stub.