Kauaʻi, anglicized as Kauai, is one of the main Hawaiian Islands. It has an area of 562.3 square miles, making it the fourth-largest of the islands and the 21st-largest island in the United States. Kauaʻi lies 73 miles northwest of Oʻahu, across the Kauaʻi Channel. The island's 2020 population was 73,298. Styling itself the "Garden Isle", Kauaʻi is the site of Waimea Canyon State Park and Na Pali Coast State Park.