Australia
Australia is a massive country that consists primarily of sand, rocks and poisonous animals. The vast majority of the country is difficult to access, and as a result, the majority of local geohashers are based in capital cities.
Key Locations
Melbourne is stocked full of good looking, talented and of course modest geohashers. It's currently the most active graticule, comprehensively thrashing its nearby and less fortunate neighbours in South Australia. Frequent hashers are:
Adelaide has the esteemable Unwise Owl steadfastly hashing his way through two graticules; other Adelaide hashers are Bob the Fish and Nathan.
Sydney suffers somewhat, namely because half the graticule is way out in the middle of the ocean, but Gormster and RikkyC generally make an effort to get out and about to fly flag for the New South Welshmen.
Brisbane is active from time to time as well.
Canberra started out with a hiss and a roar back in the early days of geohashing, but appears to have atrophied somewhat. It's probably something to do with politics.
You can obtain a list of Australian geohashing groups in the Australia category. Canberra's is obviously the coldest.