Australian soft-horror about couple traveling along coast?

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Some days, I'm adding to a list of "everything I ever watched"...

In that regard, I'm wondering about a movie or TV Movie that I suspect was Australian.

IIRC, a young couple for their holiday decided to explore and camp along the coastline for some days. I think eventually they could sense someone was out there, following them. One day, possibly one of them went missing? I think towards the end they were running through a mangrove to hope and escape? I suspect it's a movie from between late 70s and early 90s.

Not important just wondering from time to time, as I generally love coastlines and thrillers.