A continuation of the Caledon Mountains skirts the eastern side of the county .
The county is a lofty table - land that is about 1,700 feet ( 518 m ) above sea - level and about 1,400 feet ( 427 m ) above the level of downtown Toronto .
A continuation of the Caledon Mountains skirts the eastern side of the table - land .
The county is a lofty table - land that is about 1,700 feet ( 518 m ) above sea - level and about 1,400 feet ( 427 m ) above the level of downtown Toronto .