Arethusa Falls is a waterfall in the White Mountains of New Hampshire in the United States. The waterfall occurs when the headwaters of Bemis Brook tumble over a granite cliff on the western slope of Crawford Notch. Arethusa holds the distinction of being the tallest single-drop waterfall in New Hampshire; some high-angle cascades surpass it in height, such as the Mahoosuc Range's seasonal Dryad Falls. Arethusa Falls was discovered by Edward Tuckerman in 1875.