In the pre-Russian period there were fortified towns ( koç ketty ) spread out among the Selkup, enclosed with ditches, earthen walls, and palisades and with approaches protected by crossbow-guarded forests. Later settlements were built without defensive structures, usually on the high banks of rivers along the mouths of tributaries, channels, and old riverbeds. As a rule, the settlement consisted of a small number of dwellings (from two to four), constructed either in a row along the river or arranaged randomly. Frame-post yurts reinforced by sand or turf ( çuy-mo, poy-mo ) , or framework houses served as dwellings; among the Northern Selkup there were tents of the Nenets or Evenki type. Sometimes several dwellings were built in summer and winter in places suitable for hunting.