We present observations at 1.3 millimeters wavelength of the \beta Pictoris debris disk with beam size 4 \farcs 3 \times 2 \farcs 6 ( 83 \times 50 AU ) from the Submillimeter Array .
The emission shows two peaks separated by \sim 7 ^ { \prime \prime } along the disk plane , which we interpret as a highly inclined dust ring or belt .
A simple model constrains the belt center to 94 \pm 8 AU , close to the prominent break in slope of the optical scattered light .
We identify this region as the location as the main reservoir of dust producing planetesimals in the disk .