[1] Popran Creek runs through the entire valley and rises in the locality of Central Mangrove and then flows for approximately 24 km (15 mi) in a mostly southern direction until it reaches Mangrove Creek.

The history of Popran Creek and Glenworth Valley includes pre and post-European settlement.

Indigenous people from the 'Daruk' and 'Darkinyung' communities populated the lower Hawkesbury region- migrating between valleys hunting and fishing.

After initial exploration by Europeans primary industrial activities included timber getting, small farming, dairying and fishing.

Some of these settlers remained in the Mangrove and Glenworth Valley locality for at least five generations.