The latest mention I could find was “Rk,” or rock, written on a 1925 Territory of Hawaii map near Kaula. In 1864, Scottish plantation owner Elizabeth Sinclair purchased Niihau from Kamehameha ...

...FLOOD WATCH FOR NIIHAU, KAUAI AND OAHU... * WHAT...Flash flooding caused by excessive rainfall is possible. * WHERE...The island of Niihau, Kauai, and Oahu. * WHEN ...