Heritage-listed Sydney Opera House are major tourist attractions. Central Station is the hub of Sydney's rail network, and the main passenger airport serving the city is Kingsford Smith Airport, one of the world's oldest continually operating airports. Toponymy In 1788, Captain Arthur Phillip, the first governor of New South Wales, named the cove where the first British settlement was established Sydney Cove after Home Secretary Thomas Townshend, 1st Viscount Sydney. The cove was called Warrane by the Aboriginal inhabitants. Phillip considered naming the settlement Albion, but this name was never officially used. By 1790 Phillip and other officials were regularly calling the township Sydney. The town of Sydney was declared a city in 1842. The Gadigal (Cadigal) clan, whose territory stretches along the southern shore of Port Jackson from South Head to Darling Harbour, are the traditional owners of the land on which the British settlement was initially established, and call their territory Gadi (Cadi). Aboriginal clan names within the Sydney region were often formed by adding the suffix "-gal" to a word denoting the name for their territory, a specific place in their territory, a food source, or totem. The modern Greater Sydney area covers the traditional lands of 28 known Aboriginal clans. History First inhabitants of the region The first people to inhabit the area now known as Sydney were Aboriginal Australians who had migrated from northern Australia and before that from southeast Asia. Flaked pebbles found in Western Sydney's gravel sediments might indicate human occupation from 45,000 to 50,000 years BP, while radiocarbon dating has shown evidence of human activity in the Sydney region from around 30,000 years ago. Prior to the arrival of the British, there were 4,000 to 8,000 Aboriginal people in the greater Sydney region. The inhabitants subsisted on fishing, hunting, and gathering plant foods and shellfish. The diet of the coastal clans was more reliant on seafoods whereas the food of hinterland clans was more focused on forest animals and plants. The clans had distinctive sets of equipment and weapons mostly made of stone, wood, plant materials, bone and shell. They also differed in their body decorations, hairstyles, songs and dances. Aboriginal clans had a rich ceremonial life which was part of a belief system centering on ancestral, totemic and supernatural beings. People from different clans and language groups came together to participate in initiation and other ceremonies. These occasions fostered trade, marriages