On top of Danby Slide, a slick, 18m-long chute of the Mill River in Danby, Vermont, Samantha Gill eased down to sit in a rush of water. Her hands were splayed back. Elbows locked. A roar of current tugged at her toes.
"OK, here it goes," she said.
The river took hold, and Gill was descending, no stopping now. The ride skirted a rib of exposed stone, then bumped left, diving steep to a drop, plunging Gill 1m into a bubbling pool below.
She came up smiling, slicking her hair back.
"An old pro," said Dave Hajdasz, a fellow slider standing on the bank of the stream.
It was a Sunday afternoon, muggy and hot by Vermont standards, and Gill was out on an adventure. "I swim here and do these slides," she said, motioning upstream toward a gorge of falling water.
Natural water slides - essentially whitewater chutes navigable on your rear end - flank rivers and streams in places like Vermont, where tumbling water and time have worn smooth paths over stone. Rides like the Danby Slide, an unmarked locals' play spot just west from Route 7 in a gorge above its namesake town, provide a slippery fast slope, slicked with algae and smooth enough to be safe, allowing humans to slide like otters off a riverbank.
"You feel like a kid again doing this," said Hajdasz, a 45-year-old financial planner from Meriden, Connecticut. "I can do it all day long."
In late July, under a faultless blue sky, I joined Hajdasz to tour some water-slide sites around the state. As a contributor to www.swimmingholes.info, Hajdasz was in Vermont for the weekend, taking notes and photographs for the site. "I'm the regional correspondent," he said, dripping wet and smiling after a dip.
Natural water slides, found in most states, range from 3m-long child-friendly chutes to harrowing steep descents that launch sliders from the lip of a waterfall. Shallow water and slick stone are defining traits. Water levels dictate a slide's speed and seriousness; heavy rain or springtime flooding can create dangerous conditions.
New England, Vermont and New Hampshire boast dozens of slides in the White and Green Mountains, where old hills with bedrock-bottom creeks can create perfect sliding. Maine can claim at least eight slide sites, including the mellow Ledges Slide at Baxter State Park in the northern part of the state, and the more precipitous Cataracts Falls, a 9m plunge near Andover in western Maine.
Pennsylvania's Ohiopyle State Park, southeast of Pittsburgh, has two slides on the Youghiogheny River. "Sit in the creek bed and ride the water," the park's Web site advises. An observation deck overlooks a 9m-long flume.
Outside the US, sliders zip with river currents off drops from Nigeria to Fiji. Samoa, Australia, Israel, Nigeria, New Zealand and Belize have highlighted slides on www.naturalwaterslides.com, a site that catalogs water slides around the globe.
Most water slides are do-it-yourself adventures, often a side activity to a day swimming in a creek. Whitewater rafters might slide a stream as an ancillary activity. Slide locations are rarely marked, and only a handful of guide companies lead trips to water slides.
Robert Netzer, a 34-year-old engineering manager from Bloomington, Minnesota, had never heard of a natural water slide before traveling to New Zealand last winter. "Our guide held us over the falls by our ankles, then let go," he said, describing a head-first plunge canyoneering near Queenstown.
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