Guldulo, or Goodoolo is an area of Portland Reach on the Hawkesbury that was pointed out by the Aboriginal people sharing information with Rev John McGarvie as he recorded a list of place names in use by the local Darug and Darkinyung people along the river in 1829. The word probably means flint/hard stone for spear points, suggesting that this area was a source for the stone, or that stone points were made here.

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