Tren Krom Break

The Tren Krom Break was a lava lake near Ta-Koro where Ignalu surfing competitions are often held. The existence of the Tren Krom Break has been confirmed by Jala (now Jaller) on MNOG and on a Mata Nui map. It is also obvious what Vakama named it after, but it is unspecified as to why, as Tren Krom had no connection with Vakama, as the Turaga of Mata Nui name these places after entities who influenced them as Matoran, Nokama and Toa Naho for example. And, because on the Bionicle Mask of light movie Jaller called the place where Takua found the Avohkii "the lava break" it could mean that this is the lava cavern where the Turaga hid it.

the Matoran-Rahi War. It was abandoned when Jaller was forced to fall back behind the city.
 * The Ta-Koro Guard occupied an outpost here to defend against the rahi threat during