Silay City occupies the central portion of Negros Occidental. It is 14 kilometers north of Bacolod City, the province’s capital. Its northern and southern boundaries are separated by the Municipality of E.B. Magalona and the City of Talisay respectively while its eastern boundary is separated by Mount Mandalagan mountain ranges and the western boundary is defined by Guimaras Strait. Silay is characterized by a broad plain terrain of about seven kilometers in width starting from its coastline along Barangays Guinhalaran, Mambulac, Lantad and Balaring and extending inland to about twenty-five kilometers. Beyond this limit are series of rugged hills and mountain ranges covering Barangays Capitan Ramon, Guimbala-on and Patag. Three major rivers namely Malogo, Malisbog and Imbang with several tributaries criss-cross the entire area of Silay making it conducive to crop production.
Silay has a total land area of 214.8 square kilometers representing 2.71% of the total land area of the Province. In 2011, Resolution No. 11-2103 was passed adopting the Municipal Waters of Silay City delineating its territorial waters which covers an area of approximately 95.68 square kilometers or 9,568 hectares, pending the final approval of NAMRIA.