Holt Summerdell is a tranquil place in northern Green Isle. Before the arrival of wildcats, it was a holiday home for otter clans. For a long time it was believed legend, but Ould Zillo the Bard knew otherwise. When Riggu Felis was tyrannizing the clans, many otters fled to Summerdell. After Tiria Wildlough's defeat of the wildcat, the clans relocated there under the leadership of Tiria, as Queen and High Rhulain.
Holt Summerdell appeared in High Rhulain.