The relatively small RotomàCaldera (also known as RotomàEmbayment, Rotomàvolcanic complex, and spelled Rotoma) is in the Taupà  Volcanic Zone in the North Island of New Zealand.
The RotomÃÂ Caldera is located halfway between the city of Rotorua and town of WhakatÃÂne, with its in filling Lake RotomÃÂ being the easternmost in the chain of three volcanic lakes to the northeast of Lake Rotorua. The other two are Lake Rotoiti and Lake Rotoehu.
The RotomàCaldera is immediately to the northeast of the area previously called the Haroharo volcanic complex, and now known as the Haroharo vent alignment. This is now regarded as part of the much larger à Âkataina Caldera ( à Âkataina Volcanic Centre). It has been usually classified as part of this volcanic structure, but given the evidence that it is a region of structural collapse beyond the à Âkataina Caldera rim is perhaps best called an embayment. It is associated with the northern fault boundary zone (Rotoehu Fault, Manawahe Fault, North RotomàFault, Braemar Fault, Mangaone Fault) in the WhakatÃÂne Graben part of current rift activity in the Taupà  Volcanic Zone. The caldera is likely overlying the former drainage valley that historically Lake Rotorua used before the Rotoiti eruption of the à Âkataina Caldera 47,400 ñ 1500 years ago. The Rotomàvolcano's most prominent feature Lake Rotomàwas formed within the Rotomàcaldera when lava flows following a large crater explosion blocked its outlet. The major eruption episodes were about 7412 BCE with about of material erupted from 3 different magmas from several different vents. This eruptive sequence was associated in time with ruptures in the Manawahe Fault about to the north-east. It is known that the changes in vegetation following the eruption, while significant, were short-lived. Pre-eruption forest and mire vegetation recovering to former levels within about 106 years.