Canoes, currents and kin: re‑mapping the Coral Sea as an Indigenous interaction sphere

The story still begins inland on the Great Papuan Plateau, where Walufeni Cave has produced small marine shells that reached the shelter about 3,200 years ago despite the coast lying well over 200 kilometres away, and while that single measurement looks modest it anchors a wider picture in which people, knowledge and valuables already moved with intent across a vast seascape long before colonial borders were imagined.

Because Australia and New Guinea were once connected as the Ice‑Age landmass of Sahul and then were separated by rising seas in the early to mid‑Holocene, it might be easy to picture a watery barrier where land had been; yet the island chain across Zenadh Kes (Torres Strait) and the reefs of the Coral Sea created reliable stepping‑stones that skilled navigators could traverse using seasonal winds, local star paths and intimate readings of currents and tide.

Archaeologists now describe this long‑running connectivity as a Coral Sea Cultural Interaction Sphere, a model that pulls together archaeological, ethnographic and linguistic signals of two‑way exchange that link southern New Guinea, the Torres Strait and Cape York; under this lens, the shells from Walufeni look less like curios and more like the highland end of journeys undertaken by expert sea people who also walked river corridors and mountain passes.

And when we follow the most durable traces that accompany such movement the picture strengthens, because Lapita‑period pottery appears on Papua New Guinea’s south coast at sites such as Caution Bay and Hopo roughly 2,900–2,600 years ago, which places experienced potters on shorelines facing the Coral Sea during the same centuries that other forms of exchange appear in the record.

Meanwhile on Australia’s side of the sea the oldest securely dated Aboriginal pottery so far comes from Jiigurru (Lizard Island) on the Great Barrier Reef, with use roughly 2,950–1,815 years ago; although those vessels are not Lapita in style, the timing and technological know‑how place local makers in the same regional conversation that joined Papua New Guinea and the Torres Strait.

The Strait itself adds layered evidence, since locally made pottery is present at Mask Cave in the western islands while imported sherds identified on the eastern Murray Islands show that ceramic containers also crossed the water.

Read together, these lines show the Coral Sea working as connective tissue rather than as a dividing line, so when we re‑map the region with Indigenous seafaring at the centre, the scattered finds – highland shells, south‑coast Lapita and both local and imported pots in the Strait – fall into place as material milestones along routes that First Peoples maintained for generations.