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We once saw a big red bellied black snake while out camping in NSW that was about 1.5m... luckily on that occasion we were in a van not a tent! The only other live snake I've seen was a tiny one about 10cm long.

We had one of those in our front yard a couple of years back, it was quite a big one.
We saw it leaving our yard as we were driving out the driveway and I was glad I was in a car.