Sydney Harbour: Vastly Larger Than One Hectare

Sydney Harbour spans approximately 55 square kilometers (5,500 hectares)—5,500 times larger than a single hectare (10,000 square meters). This drowned river valley (ria) stretches 20 kilometers inland, with 240 kilometers of shoreline, numerous islands, and iconic landmarks like the Opera House and Harbour Bridge.

Its immense size supports a busy port, ferry network, recreational boating, and diverse marine habitats. The harbour is a defining feature of Sydney's identity and economy.