San Miguel is a landlocked municipality in the coastal province of Surigao del Sur.
The municipality has a land area of 558.00 square kilometers or 215.45 square miles which constitutes 11.31% of Surigao del Sur’s total area. Its population as determined by the 2020 Census was 41,809. This represented 6.51% of the total population of Surigao del Sur province, or 1.49% of the overall population of the Caraga region. Based on these figures, the population density is computed at 75 inhabitants per square kilometer or 194 inhabitants per square mile.