Fort Nakayama is a Hiyoshi outpost the Mongols captured during the invasion. You raid it with Sensei Ishikawa in The Tale of Sensei Ishikawa, the tale that gives you the Half Bow.
Jin and Ishikawa search for his missing student Tomoe. Finding her camp abandoned with blood on the ground, Ishikawa fears she was taken to the fort, and the two attack it together.
Tomoe was held here and bought her freedom by agreeing to teach the Mongols archery. She later says she gave the prisoners here a quick death.
Sensei Ishikawa's Dojo
Sensei Ishikawa's Dojo is the archery master's training hall in Hiyoshi. Several Ishikawa tales start here, and a piece of vanity gear is hidden nearby.
Adachi Estate
Adachi Estate is the abandoned home of Clan Adachi in Izuhara, where most of Lady Masako's family was murdered. You investigate it in The Tale of Lady Masako and come back during The Husband.
Aoi Village
Aoi Village is a village on the Tsutsu Plains that the Mongols occupy at the start of Act 2. Freeing it gives you the Key of Aoi, one of the keys for The Unbreakable Gosaku.
Arrow Peak Shrine
Arrow Peak Shrine is a Shinto shrine climb in Azamo, Izuhara, dedicated to Inari, kami of agriculture. Reach the summit to earn the Charm of Inari, a major charm: increases the supplies, predator hides, bamboo and yew wood you collect.