Mountain View Hot Spring sits in Ariake, part of Izuhara, and is one of the game's 20 Hot Springs. Soak there once and Jin's maximum health goes up permanently.
North of the Winding Trail, in the Ariake part of Izuhara.
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.
Azamo Bay
Azamo Bay is a Mongol-held port town in Azamo Prefecture. You sneak in during The Broken Blacksmith to rescue Taka, then free it for good in Unfinished Business.