Folde

Folde was an ancient and historic region of Rohan, close to the King's courts in Edoras, which indeed originally held the King's seat at the town of Aldburg. It was the homeland of the royal family.
The Folde was the centre of the kingdom. Its boundary eastward was roughly a line South-west from the junction of the Snowbourn and Entwash to the mountains; the Eastfold was the land from that line east to the Fenmark between Entwash and the mountains; the Westfold was along the mountains as far as the River Isen.
The defensive center of the Folde and Eastfold was at Edoras.