Barrow Mounds

Tombs in the lands of the Red Cow Clan
 * They are the remains of Orgovaltes heroes.
 * There are some two dozen mounds.
 * They form part of the Red Cow Tula
 * The clan does not allow outsiders to this place.
 * Most are 200 feet across and 20 feet high.
 * The largest is Grave Hill which is 150 feet high and 600 feet across.

Source: Coming Storm