Samaná is located in a small plain close to the coast but, now, most of the city is in the hills that enclose the plain.
It is the largest municipality of the province. It has a total area of 412.11 km2 (almost 49% of the total area of the province), including the three municipal districts that are part of the municipality.
Most of the territory is occupied by the Sierra de Samaná, a short mountain range with steep slopes but no high mountains. The highest mountain is Monte Mesa (605 m).
The mean annual rainfall in Samaná is 2,349.8 mm and the mean annual temperature is 26.5°C
