Big (& Little) Moose Pond Trailhead, Greenville, Maine This moderate loop is approximately 4.25 miles with about 700 feet of elevation gain. The wonderful loop passes by two ponds and over the top of Little Moose Mountain. The trail includes a fabulous waterfall close to its start and proceeds to the very pretty Big Notch Pond, which has a campsite and a sweet beach for great pond access and swimming. Moose are often seen in the area, so keep an eye out for them! There are some backcountry camping sites along the route.