Here's Sierra de Cordobo, a mountain range in central Argentina
And here's a Sierra Mackerel
But maybe you're interested in The Sierra Club, one of the oldest, largest, and most influential grassroots organization in the US. It was founded on May 28, 1892, in San Francisco, by the conservationist and preservationist John Muir. The Sierra Club has hundreds of thousands of members in chapters located throughout the country.