Main Page | See live article | Alphabetical index The geoduck (pronounced "GOO-wee-duck") is not a duck at all, but a species of large saltwater clam. Native to the Pacific Northwest coast of the United States and Canada, the geoduck (Panope generosa) is the largest burrowing clam in the world, weighing in at anywhere from 1-3 pounds at maturity. The appearance of geoduck's large, protruding siphon has led to the mistaken belief that the geoduck has properties of an aphrodisiac. This article is from Wikipedia. All text is available under the terms of the GNU Free Documentation License.