Mamey is a barrio located in Patillas, a municipality on the southern coast of Puerto Rico in the central-eastern region. The barrio spans approximately 3.46 square kilometers and forms part of Patillas's rural and mountainous interior, situated inland from the coastal areas that define much of the municipality's geography. The terrain in this part of Patillas rises into the foothills and mountains that characterize Puerto Rico's interior, with vegetation and climate typical of the island's southern slopes.

As a rural barrio within Patillas, Mamey reflects the agricultural and dispersed settlement patterns common to inland areas of the municipality. The landscape consists largely of forested and open land interspersed with scattered residential properties and small-scale farming operations. Properties in Mamey tend toward larger parcels and acreage rather than densely subdivided lots, reflecting the barrio's rural character and lower population density compared to urban centers.

The property ownership landscape in Mamey follows patterns typical of rural Puerto Rico, where land records held by CRIM document individual parcels and their histories. For those researching property ownership, boundaries, or transaction history in Mamey, Propieda provides access to cadastral and property records available for this barrio.

Patillas: Patillas, on the southeast coast, offers the "Emerald of the South" character with reservoir recreation, coastal access, and agricultural surroundings.