The Higashi Sanjoden of the FUJIWARA family, known as a typical shinden-zukuri of a very wealthy family, had a spring called 'senkan izumi,' around which rocks were arranged, and the corridors floored with boards on the north and the south sides of the spring were called izumiro.
こんこんと湧き出る泉はたとえば藤原代々の氏の長者屋敷として知られる東三条殿は寝殿造りの代表的なもので「千貫泉」と呼ばれる泉があり、周囲に立石が施され、泉の南北の廊は板敷となって泉廊と呼ばれていたことがわかっている。