The Fenambosy Chevron is one of four chevron-shaped land features on the southwest coast of Madagascar, near the tip of Madagascar, high and inland. Chevrons such as Fenambosy have been hypothesized as providing evidence of "megatsunamis" caused by comets or asteroids crashing into Earth, although has been challenged by other geologists and oceanographers.
The Burckle crater about east-southeast of the Madagascar chevrons is hypothesized to be an asteroid impact crater that caused the megatsunami about 4,500 to 5,000 years ago.