Adelaide is an interesting case study. There is a river and nature reserve that stretches from the hills to the coast that cuts right through the city. They do incur on the edges of it in a few locations but for the most part it's got native vegetation for the full length of it. It's one of the many nature corridors there, and the network of nature corridors continues to expand throughout suburbia. They also have a ring of parklands around the CBD all of which have native vegetation in at least some areas if not quite the whole area.

They're not unique in having a river cutting through the city, but they were lucky to have the foresight of a city planner who felt there was some value in keeping the native vegetation all the way back at the city's inception.

There is beautiful and diverse birdlife throughout the city and that's in no small part due to the amount of native vegetation kept around throughout the city and suburbia. From the surrounding hills, the suburbs just look like a regular forest with some buildings poking out here and there, it's incredibly green. There is about as much parklands as there is real estate in the CBD itself.

https://d31atr86jnqrq2.cloudfront.net/images/aerial-city-ade...