Geography
Mount Arayat stands in the middle of the flat Central Luzon Plain, consisting of rice paddies and a typical elevation of about 15 to 35 metres MSL. The mountain is topped by a circular volcanic crater about 1.2 km in diameter, much of which has collapsed on the western and part of the northern rim due to erosion. This has resulted in a breached crater which opens in a west-northwest direction. This area is the apparent source of a major debris-avalanche deposit that forms hummocky terrain beyond the west and northwest sides of the volcano. The 1026-metre summit stands on the northeast side of the breached crater, known as North Peak, while the 984-metre Pinnacle Peak is located on the southeast crater rim. Post-collapse activity formed an andesitic dome known as White Rock in the collapse amphitheater.
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