Kauaʻi or Kauai is geologically the oldest of the main Hawaiian Islands. With an area of 562.3 square miles (1,456.4 km2). From the soaring cliffs of the Napali Coast to the vast chasms of Waimea Canyon, Kauai embraces the senses like no other destination. You may explore the island via land, sea or air. Discover 50-miles of heavenly beaches from Poipu Beach to Hanalei Bay.