<P> The city straddles both sides of the Balcones Escarpment , a fault line in which the areas roughly east of Interstate 35 are flat and characterized by having black , fertile soils of the Blackland Prairie , and the west side of the Escarpment which consists mostly of hilly , karst - like terrain with little topsoil and higher elevations and which is part of the Texas Hill Country . Located about 20 miles ( 32 km ) north of downtown Austin , Round Rock shares a common border with Austin at Texas State Highway 45 . </P>
<P> The city straddles both sides of the Balcones Escarpment , a fault line in which the areas roughly east of Interstate 35 are flat and characterized by having black , fertile soils of the Blackland Prairie , and the west side of the Escarpment which consists mostly of hilly , karst - like terrain with little topsoil and higher elevations and which is part of the Texas Hill Country . Located about 20 miles ( 32 km ) north of downtown Austin , Round Rock shares a common border with Austin at Texas State Highway 45 . </P>
how close is round rock texas to austin texas
how close is round rock texas to austin texas
shares a common border
shares a common border