The unoffical Gathering Darkness campaign by "Mad" Alfred Nuñez Jr. has a write up of Halheim.
"Halheim The poor fishing and farming village of Halheim has 30 residents and is located along the River Haselnuss, a tributary of the River Teufel, and just off the Übersreik-Nuln Road. Halheim is 8 miles from Übersreik, 10 miles from Messingen, 3 miles from Buchendorf, 28 miles from Streche, and 29 miles from Merretheim. The village has a hall along the river where assemblies and religious celebrations take place. Solveig Loewi is the village headswoman and priestess of Taal and Rhya. "
Conquering Darkness, Part Four and Finale of the Gathering Darkness Campaign.