Lake Ozette is the largest unaltered natural lake in Washington state at 29.5 km2.The Makah name for Lake Ozette was Kahouk meaning "large lake".8 mi long and 3 mi wide, Lake Ozette is contained within the northern boundary of the Olympic National Park's coastal strip. It is 29 ft above sea level and is drained by the Ozette River in the north end. Ozette, Washington, lies at the north end of the lake. At 331 feet deep, its bottom lies more than 300 feet below sea level.