Siquijor is an island province in the Visayas. It lies southeast from Cebu and Negros across Cebu Strait (in some references called Bohol Strait) and southwest from Bohol. Panglao Island which is part of Bohol province has a similar composition of the soil which was also found in the whole island of Siquijor. Bohol is also located north of Mindanao separated by the Bohol Sea.
With a land area of 343.5 km² and a coastline 102 km long, Siquijor is the 3rd smallest province of the Philippines. The highest peak at the center of the island is Mount Bandilaan.
The climate in Siquijor like most of the rest of the country is very tropical. It is dry from January to May and wet the rest of the year. Annual rainfall is 1000 to 1300 millimeters with November having the heaviest rainfall and April having the least. Siquijor has an average temperature of 28 °C and a humidity of 78%.