Lake Lalolalo is a circle of black water inside sheer walls fifty metres high on Wallis Island, Uvea, in the French territory of Wallis and Futuna in the South Pacific, a crater lake 400 metres across and 88 deep, fresh at the surface and nearly seawater at its floor, and it is walked to through forest that traditional law keeps standing and looked down into from the rim at midday, when the sun clears the wall and lights the whole basin. The lake fills a maar blown open in a single blast in the late Holocene, geologically newborn, one of several on the island with Lanutavake and Lano, and its walls drop vertically into water so dark that the bottom was sounded only recently; the track leaves the road and closes over with trees that Wallisian custom, the vao tapu, has protected as a sacred forest, and comes out on the lip with no fence, the circle of water below reflecting the sky in the middle and the walls in black at the edges, with white-tailed tropicbirds working the air inside the crater, so that they ride the updraught under the feet rather than over the head. The deep water is sulphurous and without oxygen, and Wallisian stories put blind eels in it.
Uvea is a low island of villages, churches and coconut palms inside a lagoon, with a king and a customary law alongside the French, and the lake is its one dramatic sight, reached by car in twenty minutes from the town of Mata-Utu with no facilities at the rim. The island takes about three metres of rain a year, most in the wet season from November to April when cyclones also run, and from May to October the trade winds bring drier air, clearer skies and a firm track to the rim. The American forces of the war left a few relics in the forest around it. Lalolalo is a hole in an island filled with black water, and the forest around it is kept by custom.