Kettle achieved this with a central grid oriented roughly north and south beside the harbour with designed-in features, such as The Octagon, circled on the landward side by a reserved Town Belt to separate the city from its suburbs, the waters of the harbour forming its other margin. The modern central city is a Temple Plain. The carriageways descending the landward escarpment, such as High Street and Stuart Street, extraordinarily steep for the horse-drawn age, afford dramatic views of the town in its setting, as its author intended.