Because the Taconic Mountains are geologically related and contiguous with the interior Hudson Highlands well east of the Hudson River Valley, the southern boundary of the Taconics is difficult to define. Some notable South Taconic peaks include Mount Frissell, the south slope of which contains the highest point in Connecticut at ; Bear Mountain , the highest mountain peak in Connecticut; Alander Mountain and Brace Mountain , Mount Everett , the highest point in the South Taconic subrange and the home of an upland pitch pine and scrub oak biome; and Mount Fray , home of the Catamount Ski Area. Bash Bish Falls, reputedly Massachusetts' highest waterfall, is located in the South Taconic Range. The Appalachian Trail traverses the eastern escarpment of the range; the South Taconic Trail traverses the western escarpment.