The Brisbane River Estuary facilitated European settlement of the surrounding region. As the estuary was progressively engineered to facilitate economic growth, its behaviour, character and colour changed. Today the estuary no longer serves as the backbone of Brisbane's economy, providing no natural resources nor passage to large vessels beyond the central business district. This is unusual for an estuary flowing through a capital city. Whilst other cities around the world continue to engineer their estuaries to support their respective economies, Brisbane has the relatively uninhibited opportunity to improve its estuary's ecological potential and appeal.