Mount Toby, 1,269 feet (387 m), is the highest summit of a sprawling collection of mostly wooded hills and knolls that rise from a distinct plateau-like upland in the towns of Sunderland and Leverett, Massachusetts, just east of the Connecticut River.

Additionally, there are several cliffs located on the lower south and southwest facing slopes overlooking the Connecticut River Valley and the town of Sunderland.

Like other peaks in the Connecticut River Valley in the 18th century, a resort hotel was built on the summit of Mount Toby, but it burned down a year after it was constructed, and was not rebuilt.

About 200 million years ago, as the continent of North America began rifting apart from Africa and Eurasia, a series of erosion and deposition episodes interspersed with heavy basalt lava flows created this layer cake.

[2] The west and south sides of Mount Toby drain via a series of brooks into the Connecticut River, thence Long Island Sound.

Located on the east side of the mountain is a series of waterfalls, pools, potholes, chutes, and cascades that plummet one hundred feet over rugged conglomerate ledges.

Gunn Brook Falls, located on the lower west side of the mountain, near the Connecticut River, and accessible via a short path from a public road, is smaller but has a more consistent flow.

Slip Dog Falls is located in the center of the Mount Toby geography, west of the main summit and furthest from road access.