Il Miglio Idroswim

The morning in Idro begins with a specific buzz around the docks, as local volunteers from The Real BTeam set the stage for a day where the water takes center stage. This annual gathering brings together regulars who know the lake’s temperament and newcomers drawn by the challenge of its glacial depths. The atmosphere is grounded in the local community, where the town wakes up early to support the athletes arriving for their respective starts, creating a tradition that feels more like a shared venture than a standard competition.

Navigating the glacial basin

Swimming here means crossing a body of water that hits 122 meters at its deepest point, a consequence of its glacial origin at 368 meters above sea level. As you navigate the course, you are technically swimming in the path of the Chiese river, the lake's primary feeder originating from the Adamello glaciers, which maintains the fresh character of these waters. It is common to see great crested grebes or grey herons along the shore, and while local lore whispers of the 'Idra' monster hiding in the deep, your focus remains on the clear lines of the buoys. The steep, dramatic slopes of Mount Censo dominate your field of vision, acting as a constant reference point throughout the swim.

Historical markers in the water

History is not just on the shore; it is part of the landscape you traverse. Your line takes you within sight of the Rocca d'Anfo, a massive 15th-century complex built by the Republic of Venice to guard the border against the Bishopric of Trento. The structure, later expanded by engineers serving under Napoleon, stands as a reminder of the strategic importance of this valley. The area is deeply connected to its past, from the nearby Forte di Valledrane, built to control the surrounding roads, to the remnants of the historical tramway that once served military logistics during the First World War. Whether you opt for the 926m sprint, the 1852m classic mile, or the 3704m double, the experience remains defined by the interplay between the crisp, high-altitude water and the towering fortifications that have watched over these shores for centuries.