A similar entry appears in the Wheel of Time Companion, confirming the information. Other information is also included in the Companion, but we did not use it in the TarValon.Net Library.
The Paerish Swar, or great Darkwood, is a large forest between Almoth Plain and the Mountains of Mist, next to the large lake there. In earlier times, the area was part of Safer then later Darmovan, though there is no indication there was a forest there in those years (LoC, Ch. 20).