The Largest Caldera on the Planet (Patreon)

The largest caldera on the planet is not Toba, which measures 100 kilometers long and 35 kilometers wide. Rather, it is the Apolaki caldera which is located in Philippines maritime claims. It measures ~150 km in diameter and formed on an oceanic plateau which could be best described as a "low end flood basalt". This feature was only discovered in 2019 which makes me wonder how many similar features lie unnoticed in the deep ocean.