Oahu is the most populated island of the Hawaiian archipelago included in the state of Hawaii, USA. The island is surrounded by the Pacific Ocean. On the island of Oahu is the Kaukonahua River, 53 km long. Kaala Mountain is the highest on the island with a height of 1220 m above sea level. My friend sent me these beautiful photos of nature. I am pleased to share with you the wonderful landscapes of Oahu.