Altaic and Related Languages?
A few scholars have suggested that Japanese and Korean also fall into the Altaic category, although that view is difficult to support. Others think that both languages have an Altaic superstratum,* but do not belong in the family (it has also been suggested that Japanese has an Austronesian substratum). Although the membership of Japanese and Korean in an Altaic family seems highly unlikely, I have posted a map of “Macro-Altaic” that includes both languages just to be comprehensive.
Some scholars have suggested that Japanese and Korean together form a language family of their own, but support for this thesis is also scant. Japanese is usually regarded as the main language of the much more restricted Japonic family. In addition to Japanese, this family includes the languages of the Ryukyu Archipelago, such as Okinawan. These tongues are often classified as dialects of Japanese, but by purely linguistic criteria they are languages in their own right. I have thus added a small dot to the map of the Japonic languages to indicate Okinawan. Note that the Wikipedia original map ignores the Japonic category and instead classifies Japanese as an isolate, or a language that sits alone rather than forming part of a larger family. (On the classification of Japanese, see here and here.)
The Wikipedia map also classifies Korean as an isolate. I have instead placed it in the Koreanic family, as several extinct languages also fall into this group, and as the tongue of Jeju island is considered by many linguists to be distinct enough from standard Korean to be classified as a language in its own right. I have thus added a dot for Jeju. It is too large, but unfortunately I cannot shrink it any further.
*A “superstratum” refers to linguistic elements imposed on a given language by high-prestige people, often rulers, who spoke a different language, whereas a “substratum” refers to the surviving linguistic elements of a group whose language was supplanted by another tongue.
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