The first edition of Ethnologue

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SIL publishes the first edition of Ethnologue, beginning the catalogue that would become the standard reference for the number of living languages and, through the ISO 639-3 code set for which SIL is registration authority, the identifiers by which languages are named in software and library systems worldwide. Every subsequent count of the world's languages descends from an editorial procedure for deciding where one language ends and another begins, which is why the familiar figure of about seven thousand is a result rather than an observation.

A node is not a place. Drawing it on a map would assert something about the world that no stored fact supports.