Saplunara is located in the municipality Mljet, in Dubrovnik-Neretva County at an elevation of 2 meters above sea level and it covers the area of 2.20 km² (0.85 sq. miles). According to the 2011 census report, there were 68 inhabitants. It is entirely populated by Croats. Nearby places: Korita, Maranovići, Okuklje, Prožurska Luka, Prožura, Šipanska Luka, Sobra, Doli, Suđurađ and Broce.