The contiguous urban area of Ballarat covers approximately of the local government area's . Approximately 90% of the urban area's land use is residential and suburban. From the city centre this area extends approximately north to the hills around Invermay, approximately east to Leigh Creek in the foothills of Mount Warrenheip, approximately west along the plains to Lucas and approximately south along the Yarrowee River and Canadian Creek valley to the fringe of Buninyong. The central city is situated low in the valley of the Yarrowee River and surrounded by hills such that the city skyline is visible only from the hills and the lower lying inner eastern suburbs. The reach of the Yarrowee River toward Ballarat Central becomes a stormwater drain and is completely covered over as it flows under the CBD.