I have prepared a map of a country using ggplot (R studio) and zoomed in Regions, zones, and a town. I want the three study sites to appear on the map(town). I have separate longitudes, latitudes, and altitudes as shown below. Would you assist me? Thank you.

facility: DURH

Latitude; N 6° 23' 50''

Longitude: E 38° 18' 43"

Altitude: 1540.3m

Accuracy: 4.98m

facility: HRH

Latitude: N 6° 24' 30"

Longitude: E 38° 18' 50"

Altitude: 1516.8m

Accuracy: 3.9m

facility: OHC

Latitude: N 6° 25' 38"

Longitude: E 38° 16' 52"

Altitude: 1433.4m

Accuracy: 4.74m