Alemania Glacier, Glacier in Alberto de Agostini National Park, Chile.

Alemania Glacier is an ice formation in Alberto de Agostini National Park that flows toward the Beagle Channel as part of what locals call Glacier Alley. The glacier descends from mountain peaks with visible crevasses and frozen streams that can be observed from the water below.

The glacier is also called Roncagli, after Giovanni Roncagli, an Italian naval officer and hydrographer honoured in the naming. It lies in Alberto de Agostini National Park, in Chile's Magallanes and Chilean Antarctica Region. The advance of one of its lobes blocked the drainage of surrounding streams, and the water backed up to form Martinic Lake.

The glacier carries two names: Alemania, Spanish for Germany, and Roncagli, honouring the Italian naval officer and hydrographer Giovanni Roncagli. The second name is the one recorded in the French-language sources on the ice mass. Both names appear on maps and in park documentation for the same glacier in Alberto de Agostini National Park.

Reaching the glacier requires boarding boat tours that depart from Ushuaia and travel through the Beagle Channel with experienced crew members. Weather conditions can be rough with wind and waves, so visitors should wear warm and waterproof clothing for the journey.

The glacier's movement and melting have created Martinic Lake, which fills with water draining from the ice mass and surrounding slopes. This natural lake stands as a visible reminder of how glacial processes continuously reshape the landscape and generate new geographic features over time.