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📘 A pale scribble in the red country

You are over a river that spends most of its life looking like a mistake. From the window it is not a brown highway. It is a pale scribble: a wide bed of sand holding a few dark pools, a thin line of trees, and then red-tan flats running to

4
lessons
~20 min
to learn
Adults
level
Start the course →

What you’ll learn

  1. Martuwarra in the dryRead Martuwarra as a monsoon river that can cease flowing in the dry.Huge catchment, dry-season pools and Traditional Owner declarations frame the channel.
  2. Gorge and floodUnderstand Danggu gorge geology and flood-scour lines on limestone.Devonian reef cut and 2023 record peak show flood power.
  3. Crossing and 2023See Fitzroy Crossing bridges and the 2023 overtopping event.Town, gauge records and floodplain width explain crossing history.
  4. King Sound tideFollow the river to King Sound's tide-dominated delta.Extreme tides, mangroves and sawfish habitat mark the Indian Ocean mouth.

Questions this course answers

What is the Fitzroy called by Traditional Owners?

Nyikina, Bunuba and other groups know the river as Martuwarra; the English name came later.

What geological feature is Danggu (Geikie Gorge)?

Park and heritage materials describe an eight-kilometre gorge through Devonian barrier-reef limestone.

What happened at Fitzroy Crossing in January 2023?

WA Department of Water and Environmental Regulation recorded a peak of 15.81 m on 4 January 2023, above prior records.

Grounded in trusted sources

  • WA Department of Water and Environmental Regulation, 11 Jan 2023 — Fitzroy Crossing gauge peaked 15.81 m on 4 January; monitoring at the site since 1956; previous record exceeded by more than 3 m; Great Northern Highway bridge (1974) overtopped for the first time; preliminary floodplain volume over 2,000 GL/day; about 94,000 km² catchment; 20 main tributaries including Margaret, Christmas Creek and Hann; Fitzroy Crossing and Derby plus more than 50 Aboriginal communities
  • Bureau of Meteorology / NASA Earth Observatory, 10 Jan 2023 — remnants of Tropical Cyclone Ellie from 30 Dec 2022; Fitzroy Crossing peak 15.81 m on 4 January
  • CSIRO Northern Australia Water Resource Assessment (Petheram et al. 2018) / NESP environmental water needs — mean annual discharge about 6,600 GL; wet season November–April; dry May–October; late dry season the river ceases to flow in some years
  • Landgate — History of river names: Fitzroy length 733 km
  • Australian Natural Resources Atlas (archived) — catchment 93,829 km²; DWER rounds this to about 94,000 km²
  • Danggu (Geikie) Gorge National Park — 8 km gorge, walls about 30 m; wet-season level can rise about 16.5 m; flood scours limestone white; Danggu is Bunuba for the area where the water is very deep under the cave; named Geikie in 1883; 20 km from Fitzroy Crossing
  • Australia's North West / WA Parks — Devonian Reef parks (Windjana, Tunnel Creek, Danggu) are remnant barrier reef more than 350 million years old; the Fitzroy cuts the Geikie and Oscar Ranges at Danggu
  • DCCEEW National Heritage List — West Kimberley inscribed 31 August 2011, including the Fitzroy River and Geikie Gorge

Every Wunder lesson is built from real, reputable sources — never invented.

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