The Beebe River begins at Black Mountain Pond on the southern slopes of Sandwich Mountain in the town of Sandwich .
Sandwich Mountain is a 3,993 - foot ( 1,217 m ) summit in the southern White Mountains .
The Beebe River begins at Black Mountain Pond on the southern slopes of Sandwich Mountain , a 3,993 - foot ( 1,217 m ) summit in the southern White Mountains , in the town of Sandwich .