Australia was discovered by Dutch explorers in 1606 and became a British colony in 1770. It is now a constitutional monarchy and parliamentary democracy. Australia has a population of over 22 million, with the largest cities being Sydney, Melbourne, and Brisbane. The country has a diverse landscape ranging from deserts to snow-capped mountains and forests. Australia has a strong agricultural industry focused on cattle, wheat, and wool and mineral extraction is also important. Tourism is also a major part of the economy, focused on attractions like the Great Barrier Reef, Sydney Opera House, and Sydney Harbour Bridge.