The atoll consists of the three islands Uhrek, Kahlap (Capitol), and Mwandohn, forming a central lagoon of approximately 2 square kilometres in area.

Only the northeast island Kahlap is inhabited, with the town facing the lagoon.

The Marquis of Wellington was on her way to China, having transported 200 or so convicts to Port Jackson, Australia, from Britain.

Mokil Airfield is located on the southern end of Kahlap with a 1,200 feet (370 m) runway.

[2] The airfield offers no service and used by chartered flights by Caroline Islands Air.