1. A small stream which rises near Birsit Hill, flows in a northeasterly direction and after a short course it is called Little Fen Burn it then runs into Thorter Burn: SNAWDON HILL: Snawdon Hill: See Name Book Plan 15 D: 015; 016 [situation] About 2 Miles South West by South from Castle Moffat See Name Book Plan 15 D.