Increment is the unit of measure or the process of increasing. Sometimes there is no difference and they are interchangeable, but 'increment' indicates an increase in regular steps, whereas 'increase' has a wider, more general usage. This means that sometimes only 'increase' is the correct word to use.
Pidurutalagala , or Mount Pedro in English, is an ultra prominent peak, and the tallest mountain in Sri Lanka, at 2,524 m (8,281 ft). Mount Pedro is located close to the city of Nuwara Eliya, and is easily visible from most areas of the Central Province. It is situated North-North-East from the town of Nuwara Eliya.
Ryan Ozawa has it right - the summit benchmark of Mauna Kea reads 13,796 feet, although some more recent satellite measurements have indicated 13,802 feet. That's unquestionably the highest natural point in Hawaii. The enclosure for the Gemini Observatory telescope located a few hundred feet from the summit actually reaches higher than the summit, so the highest manmade point in Hawaii would be the top of Gemini's dome, at somewhere above 13,820 feet.