Roundtop Mountain is in Greene County, New York, south of Haines Falls, positioned west of High Peak and southeast of Clum Hill. Its importance in the local landscape comes from its role in dividing drainage between two watersheds: water from its north slope flows into Kaaterskill Creek, while water from its south slope runs toward Schoharie Creek. This watershed split places Roundtop within the rugged Catskill terrain, where steep valleys and closely clustered peaks shape the region’s distinctive mountain landscape.