Basalt Channels across a Wetland

Basalt Channels across a Wetland is an original illustration set in Tae Rak, Budj Bim, Victoria, Australia. It lies in mid-latitudes, where the climate is oceanic — mild, wet through the year.

Dark basalt channels, low weirs, and shallow holding ponds form an interconnected pattern through a grassy wetland beside Tae Rak. Water passes through narrow gaps fitted with woven eel baskets, while scattered lava stones, sedges, and a low wooded rim show that the structures follow an old volcanic flow rather than a modern concrete canal.

Why do low basalt walls funnel wetland water into narrow woven traps?

Gunditjmara engineers used abundant lava rock to redirect seasonal water through channels where migrating kooyang could be trapped, held alive, and harvested at different water levels. Weirs slow and divide the flow, ponds store both water and eels, and constricted passages make woven traps effective without blocking the whole wetland. The union of volcanic stone, freshwater marsh, multi-level channels, and eel-harvest structures belongs to the Budj Bim cultural landscape.

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