The paper considers the structural and semantic features of synthetic and analytical-synthetic polypredicative constructions of the Yakut language expressing spatial relations. As a result of the conducted research it has been determined that the synthetic constructions are polysemantic,
and the relationships under consideration are expressed in the cases when the dependent predicative unit within the polypredicative construction performs the function of the localizer. The spatial meanings proper are described by analytical and synthetic constructions with locative postpositions and service names, and for this reason such structures occupy a central position
in polypredicative sentences with a spatial sense. Synthetic and analytic-synthetic constructions, as means of expressing the nuclear locativity at the level of polypredicative constructions are supplied with variants represented by an analytical constructions with pronominal clips, as well as non-elementary simple structures with «folded» dependent predicates. In this case, the latter structures, unlike the synthetic bipredikative structures, describe the locative-attribute relationships and in these the localizer is a non-predicative determinatum.