[...]
locative comparative (STR) = a fixed-case strategy in comparative constructions in which there is a clause which attributes a gradable predicative scale to the comparee, and the standard is expressed as an oblique argument phrase using a spatial flag with a locative (‘on, at’) meaning. Example: Ubykh yi-gune wo-gune-n ca-qasaqa-j ‘This tree is taller than that tree’ is an instance of the locative comparative: yi-gune ca-qa- saqa-j asserts that this tree is bigger, and wo-gune-n expresses the standard, that tree, with a suffix -n meaning ‘on.’ (Section 17.2.2)