Bukit Batok (Chinese: 武吉巴督, Tamil: புக்கிட் பாத்தோக்), often abbreviated as Bt Batok, is a planning area and matured residential town straddling along the eastern boundary of the West Region of Singapore. Bukit Batok statistically ranks in as the 25th largest, the 12th most populous and the 11th most densely populated planning area in the Republic. It is bordered by six other planning areas - Choa Chu Kang to the north and northwest, Bukit Panjang to the northeast and east, Clementi to the south, Bukit Timah to the southeast, Jurong East to the southwest and Tengah to the west. Bukit Batok largely sits on Gombak norite, a geological formation that is found in high concentrations within the planning area itself, as well as in the western parts of neighbouring Bukit Panjang. It was this presence of the igneous rock that made Bukit Batok a pivotal location for the quarrying industry in Singapore around the turn of the mid-20th century.