This lazy brook winds through the Tanglewood, from the higher ground where the Thatchwork Hills plunge into the forest, down to the Churnwash. Its mouth is across from Karipur’s Farm, which lies along the northern bank of the great river. The brook is named for the dogtree, a water-loving scrub oak. The roots of the large tree grown thick and exposed, and plunge into the flowing water all along the brook. The root system puts in mind the lapping tongue of a thirsty dog, and gives these trees their name. The plum-sized acorns that drop from these trees are much loved by pigs, and the farmers of Holtan often drive their herds down to the river to drink and feed.