2020 $1 Great Southern Land 1oz Silver Opal Proof CoinAustralia is the planets sixth largest country yet the smallest of the worlds continents. Evolving across more than 3,000 million years, it is also unique as the lowest, flattest and driest continent (after Antarctica) and home to a diverse range of climates, landscapes and animals. The coins reverse features a central opal insert in the shape of the Australian continent. The outer rim of the coin depicts representations of iconic land animals