The Taconic Mountains continue north from White Rock ridge across the Hoosic River valley as Mount Anthony and south over Petersburgh Pass as Mount Raimer. The White Rock ridge is flanked to the east across the Hoosic River Valley by the western escarpment of the Green Mountains. The west side of the ridge drains into the Little Hoosic River, thence into the Hoosic River, the Hudson River, and Long Island Sound. The east side drains into the Hoosic River. Petersburg Pass, located on New York Route 2/ Massachusetts Route 2, cuts over the gap between the southernmost knob of the ridge, White Rocks, and Mount Raimer, at an elevation of .