Kauhakō Crater, Volcanic crater in Kalaupapa Peninsula, United States.

Kauhakō Crater is a funnel-shaped volcanic crater in the center of the Kalaupapa Peninsula on Molokaʻi, with a rim about 150 m above sea level, the peninsula's highest point. Its diameter measures 500 by 650 m, and a single terrace about 150 m wide lies above Lake Kauhakō, which is 248 m deep and only 50 m wide. A kilometer-long lava channel up to 150 m wide and 30 m deep begins at the crater's northeastern side.

The crater formed hundreds of thousands of years ago through volcanic activity that shaped the Kalaupapa Peninsula. This geological structure is a remnant of the early volcanic phase that built the island of Molokai.

Kauhakō is a Hawaiian name; the crater sits at the centre of the Kalaupapa Peninsula, the highest point on the peninsula at roughly 150 m above sea level. The National Park Service has checked the lake's water quality four times a year since 2009, and in September 2011 rangers found the surface covered by a white layer of hydrogen sulfide.

Kalaupapa Peninsula can only be entered with a permit arranged in advance through the National Park Service; there is no general public road access, and arrivals are by guided tour or small aircraft. The crater rim rises about 150 m above sea level, the highest ground on the peninsula, and the descent to Lake Kauhakō is steep and unmarked. Stay back from the funnel-shaped inner walls, which drop sharply toward the water.

Lake Kauhakō is 248 metres deep but only about 50 metres wide, confirmed by the U.S. Navy, giving it a greater depth-to-surface-area ratio than any other lake in the world. It is also the tenth-deepest lake in the United States. In September 2011 hydrogen sulfide rose to the surface, dissolved oxygen fell from 227.37 percent saturation in August to 2.52 by November, and the shrimp and phytoplankton died off.