Wainiha is a land section in the Hanalei district of northern Kauai. The name is Hawaiian and literally translates to "unfriendly water", probably referring to the coastline's treacherous currents. This land section is on the northern coast of Kauai and includes a bay and canal. The terrain is varied and also includes a cliff (pali), river, and valley. Wainiha is 25.49 square miles.