Navigation : PostGIS 2.5.2 Manual > ST_NumInteriorRing ST_NumInteriorRing ST_NumInteriorRing Prev 8.5. Geometry Accessors Next Name ST_NumInteriorRing — Return the number of interior rings of a polygon in the geometry. Synonym for ST_NumInteriorRings. Synopsis integer ST_NumInteriorRing ( geometry a_polygon ) ; See Also ST_NumInteriorRings