Longtable is the seat of House Merryweather in the Reach. It sits along the Mander near its confluence with the Blueburn.
Lord Ormund Hightower led the siege of Longtable during the Dance of the Dragons. Blacks from Longtable helped to fortify Tumbleton before the First Battle of Tumbleton.
After Cersei Lannister is arrested by the Faith of the Seven, Lord Orton Merryweather and Taena of Myr flee from King's Landing back to Longtable.