In 13-limit just intonation, 27/26, the small tridecimal third tone, appears as the interval between the Pythagorean major sixth of 27/16 and the thirteenth harmonic -- 13/8. It measures about 65.3¢. It is close in size to another 13-limit microtone -- 26/25. These intervals differ by the superparticular ratio 676/675, about 2.6¢. This is the island comma; tempering it out produces temperaments associated with The Archipelago.