https://www.nytimes.com/2017/09/03/us/houston-highway-resilience-snapshots.html https://www.nytimes.com/2017/09/03/us/houston-highway-resili... cites the area o

https://www.nytimes.com/2017/09/03/us/houston-highway-resilience-snapshots.html https://www.nytimes.com/2017/09/03/us/houston-highway-resili... cites the area of Houston as 600 sq miles (= 1550km^2) and the area of the Houston metro region as > 10000 sq miles (= 25900 km^2). Twice the size of Sydney metro area. The Houston metro region is the region for which we're talking about transit.