Australia is separated from New Zealand by the Tasman Sea.

- Tasman Sea:
The Tasman Sea is a body of water that lies between Australia and New Zealand. It is located to the southeast of Australia and to the northwest of New Zealand.

- Distance and Size:
The Tasman Sea covers an area of approximately 2.3 million square kilometers and has an average depth of around 3,400 meters. The distance between Australia and New Zealand across the Tasman Sea is approximately 2,200 kilometers.

- Significance:
The Tasman Sea is an important water body for both Australia and New Zealand as it serves as a major shipping route and provides access to important ports for both countries. It also plays a significant role in the climate and weather patterns of the region.

- Marine Life:
The Tasman Sea is home to a diverse range of marine life, including whales, dolphins, seals, and various species of fish. It is also a popular destination for fishing and recreational boating.

- Historical Significance:
The Tasman Sea has played a significant role in the history of both Australia and New Zealand, as it was traversed by early explorers and settlers. The sea is named after the Dutch explorer Abel Tasman, who was the first European to sight New Zealand in 1642.

In conclusion, the Tasman Sea separates Australia from New Zealand and has a rich history, diverse marine life, and serves as an important waterway for both countries.