The well studied location named Hahamog-na is the Tongva village archeological site located in the upper Arroyo Seco area just above the Devil's Gate in the present-day Altadena-Pasadena-Jet Propulsion Laboratory-JPL area. It is in the Arroyo Seco canyon-valley and on the lower slopes where the eastern Verdugo Mountains, southern San Gabriel Mountains, and western San Rafael Hills meet. The site of Hahamog-na is now within the protected natural area of Hahamongna Watershed Park, a habitat and plant community blend of: Freshwater marsh wetlands, riparian zones, native oak woodlands, and chaparral elfin forests. This Tongva settlement was later a rancheria on the large 1834 Mexican land grant of Rancho San Pascual, issued by Alta California Governor José Figueroa to Juan Maríne and Eulalia Pérez de Guillén Mariné.