Mound of Riders
This article describes a concept which is mentioned in J.R.R. Tolkien's works, but was never given a definite name.
The Mound of Riders was the burial mound raised upon the eyot in the Fords of Isen, ringed with stones and surrounded by many spears. It held all of the Men of the Mark who had fallen in the Battles of the Fords of Isen. After the battles Gandalf gathered all of the scattered Rohirrim he could find. Some joined Erkenbrand but others Gandalf set to interring the dead and then returning to Edoras. When King Théoden rode to Isengard his party came upon the mound, which reassured the king that the dead had not been devoured as carrion.