Garreg Mach Monastery is a location in Fire Emblem: Three Houses.
Located in central Fódlan amidst the mountains, Garreg Mach Monastery is the headquarters of two separate entities: the Church of Seiros and the Officers Academy. It is a neutral territory, not governed by any of the three nations of Fódlan. In addition to being a religious site, the monastery is home to an elite order of knights.
Garreg Mach Monastery can be freely roamed and explored, and once Byleth has visited a part of the monastery, the player can use fast-travel to transition to that location instantly. While roaming the monastery, Byleth can take part in numerous activities to affect their training as well as the training of the students under their tutelage.