Sunday River's summit reaches 3,140 feet, dropping 2,340 vertical feet to a base at 800 feet across 135 runs spread over 870 acres in Newry, Maine, near Bethel. Terrain splits 36 per cent intermediate, 30 per cent beginner, 18 per cent advanced and 16 per cent expert, with average annual snowfall of roughly 180 inches. The resort carries Ikon Pass access across eight interconnected peaks. Eighteen lifts, including seven quad chairs, an eight-person chair, one six-person chair and three triple chairs, serve the mountain alongside one double chair, a gondola and four surface lifts.

Sunday River's eight interconnected peaks give it one of the most extensive trail networks in the eastern United States, built up through decades of aggressive expansion from a single original mountain. The resort's reputation for dependable snow, supported by extensive snowmaking, has made it one of New England's most consistent options through variable winters. Its Ikon Pass affiliation reflects its status as a genuine multi-peak destination rather than a single-mountain resort.

Sunday River was founded in 1959 by the Bethel Area Development Corporation as a modest ski area with a single T-bar on Locke Mountain, and by 1960 it offered four runs, a T-bar and a rope tow for a lift fee of 3.50 US dollars. Sherburne Corporation, parent company of Killington, acquired a controlling interest in 1972, before Les Otten purchased the resort in 1980 and began an era of aggressive expansion.

Under Otten, the resort added North Peak in 1985, Spruce Peak in 1986 and White Cap in 1988, the latter featuring the steep White Heat trail and marking the fifth of what would become eight interconnected peaks by the decade's end. Sunday River and sister resort Sugarloaf were sold by American Skiing Company in 2007 for a combined 77 million US dollars, with Boyne Resorts managing and then fully purchasing both in March 2018. Adult daily tickets run from 89 to 159 US dollars, with multi-day packages from 178 dollars.