The higher parts of the Liverpool Range reach approximately 1,300 metres ( 4,300 ft ) above sea level .
The range formed a significant barrier to the expansion of settlement in the early period of British settlement in New South Wales .
The higher parts of the Liverpool Range reach approximately 1,300 metres ( 4,300 ft ) above sea level , and the range formed a significant barrier to the expansion of settlement in the early period of British settlement in New South Wales .