Hope you're still looking this site up,Bob. There is a Eumarella Beach in Victoria, at the mouth of the Eumarella River near Yambuk on the Great Ocean Road, and a Numarella in NSW, just outside of Cooma. The Penguin Collection of Australian Folk Songs compiled by John Manifold and first published in 1964 has the opening line of the song as "There's a long green gulley by the Numarella shore, where I've lounged through many is the day". A friend purchased a property by the river in Numeralla, NSW, and his district map of the area showed an area called "The Long Green Gully", so that seems to to be the district that the song was written about.

Nina Berry