The Dictionary of Sydney was archived in 2021.
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.