Made a stop on the island of Kauai today. Kauai was formed some six million years ago, the island encompasses roughly 550 square miles and is the oldest and northernmost of the main Hawaiian Islands. Kauai is known also as the "Garden Isle", Kauai lies 105 miles (170 kilometers) across the Kauai Channel, northwest of Oahu. Of volcanic origin, the highest peak on this mountainous island is Kawaikini at 1,598 m (5,243 ft). The second highest peak is Mount Waialeale near the center of the island, 1,570 m (5,148 ft) above sea level. One of the wettest spots on Earth, with an annual average rainfall of 460 inches (11,700 millimeters), is located on the east side of Mount Waialeale. The high annual rainfall has eroded deep valleys in the central mountain, carving out canyons with many scenic waterfalls.