flat, table-shaped structure that sit at the both banks of the river, spaced every mile; five feet high, with a diameter of fifty feet, appears to be made out of red-flecked granite; three times a day, it flares with roaring electrical energy, deafening and startling; if a grail is placed on one of the 700 depressions, it will be unharmed by the flames and convert the raw energy into edible food; appear to be somehow linked to the process of translation (see GRAIL, TRANSLATION)