19 0Built systems, built areas, and whole regions
Proportion of an urban region constituted by the metropolitan area (%)Area of urban-region ring (outside the metro area) (km2 )
Nan•Edm•Erz•Abe•Sam•
Ott•Chi+Sdt+Bra+Bam+Rom+Buc+Bar+Kag•0
6 00010 00014 00018 00022 00026 00030 000481216(29.7)(26.5)Eas•Can•Te g•Kua+
Sto+Sap+Ula•Iqu•Sdt+Rah•Nai+Phi+Bei*
Cai*Seo*
Por• Atl•Mex*
San*
Mos*
Ban*
Te h*
Ber*
Lon*Figure 7.14Area of the urban-region ring relative to the proportion of an urban
region constituted by the metropolitan area. 1000 km^2 =386mi^2. See Table5.1and
Figure 7.2 caption.space and resources, such as housing development and recreation opportunities,
occurs in the outer portions of Philadelphia’s urban region. Rapid expansion of
protected natural resources around cities with relatively small urban rings is a
high priority.[R2]Most urban-region rings are rather large (12 000 to 30 000 km^2 ), though a handful
are quite limited in area(Figure7. 14).Small urban-region rings have a relative shortage of natural and agricultural
land. Chicago and Philadelphia have small urban-region rings in part because
their metropolitan areas are very large, and as just mentioned, Philadelphia
because of surrounding cities. But cities on coastlines, such as Kagoshima and
Barcelona, may also have relatively small urban regions, due mainly to geometry
and a water body (Color Figures6 and ). Small urban-region rings may have a