Angel Falls, the world's highest uninterrupted waterfall, gets its water from a unique geological feature called a tepui—specifically, the Auyán-tepui in Venezuela. Unlike many waterfalls that are fed by melting snow or large lakes, the water at Angel Falls comes almost entirely from abundant tropical rainfall. The flat, massive sandstone plateau of the Auyán-tepui acts as a giant sponge; the heavy rains characteristic of the region's wet season (June to December) soak into the porous rock and collect in a complex network of underground fractures and sinkholes. This water then channelizes into the Kerep River, which meanders across the top of the plateau before plunging over the edge. Because it is rain-fed, the volume of the falls fluctuates dramatically throughout the year. During the height of the dry season, the water can diminish to a thin ribbon that vaporizes into mist before reaching the ground, while the rainy season transforms it into a powerful, thundering torrent that creates its own localized weather patterns at the base of the canyon.