Much of this land is not available for use, including the water reserve and runway, the causeways, and a large area of reclaimed land at Temwaiku, the eastern corner of the atoll, which is too swampy and low-lying. If these areas are excluded, the land area of South Tarawa is only just over 1,000 hectares (10 square km or 2,500 acres) and the population density of 49 people per hectare or 4,905 per square km is almost equal to the density of London (5,100 people per km2) and twice the density of Sydney or Auckland.