The Feng ("封", "夆"), seen in the oracles, bronze inscriptions, brick inscriptions and bamboo slips of State of Qin and Chu, refers to the mound that artificially stacked and on which some trees are planted. The Fengs (Aggers) usually were set up along the roads to indicate the attribution of its territory, while the Fengs in the field were placed on the banks of the field or on the road through the field to mark the attribution of the field. The Jiang ("疆", "畺", "彊"), seen in the bronze inscriptions and bamboo slips of State of Qin and Chu, refers to the line that was been artificially drawn, it can but does not necessarily manifest as natural or man-made geographical things. The Jie ("界") is also an artificial division, but there are specific natural or man-made geographical things as the logo. The geographical things that used to denote the "boundary" in Qin and Han period mainly included some man-made geographical things such as the castle, outpost, barrier, roadblock, agger, trench, abatis, stela, as well as mountains, rivers and other natural geographical things.