Mound Key State Park

Where Florida’s first empire built its capital from the sea

Added Aug 22, 2025

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Sam

Contributor & Area Historian

Mound Key is the archaeological heart of Southwest Florida. Accessible only by boat, this 125-acre state park was once the ceremonial and political capital of the Calusa, the indigenous people who built an empire from the sea. Over centuries, they raised towering shell mounds—some more than 30 feet high—that still shape the island’s ridges and trails today. In the 1500s, the Spanish established Fort San Antón de Carlos here, site of the first Jesuit mission in North America, layering early colonial infras on top of Calusa ingenuity.

Paddle through calm estuary waters, likely accompanied by playful dolphins, curious manatees, and elegant shorebirds—each scene prefacing the island’s mysteries

Reaching Mound Key is an adventure in itself—you arrive by boat or kayak, gliding through the estuary with dolphins and ospreys for company, before pulling up to the island’s mangrove edge. From there a trail carries you up and over massive shell ridges built centuries ago by the Calusa, giving you the rare sensation of hiking hills in flat Southwest Florida. It’s a walk where every step connects you to layers of history—ancient canals and courts beneath your feet, colonial ruins in the soil, and wild Florida all around.
Estero

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Estero, FL 33928

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