Identifies lexical equivalents of semantic primitives "above, under, inside, on the side," as defined by Natural Semantic Metalanguage theory, in Longgu (Solomon Islands) and argues that the first three have both a semantically primitive rational sense and a secondary topological sense. Morphosyntactic issues are discussed, including their status as "local nouns" and their suffix patterns, and the hypothetical primitive "on" is highlighted. (Author/MSE)