Lai da Sontga Maria is a deep Alpine reservoir in the Maggia Valley, Switzerland, featuring an artificial reef structure. This site is strictly for advanced technical divers, with depths ranging from 30 to 86 metres. Divers encounter cold water conditions and must manage risks including nitrogen narcosis, decompression obligations, and potential entanglement in submerged infrastructure. Visibility typically ranges between 5 and 10 metres. Entry is via the shore near the dam wall, where parking is available for kit assembly. Due to the extreme depths and cold temperatures, careful gas management and appropriate thermal protection are essential for all dives at this location.

Lago Cadano in the Maggia Valley is a meromictic freshwater lake featuring permanently stratified water layers. Divers can access the site directly from the shore. The topography includes a reef structure ranging from 11 to 21 metres in depth, with visibility typically between 5 and 10 metres. The lake contains a unique bacterial layer located within the chemocline between the oxygen-rich upper layer and the anoxic lower layer. Due to the presence of overhead environments and significant depths, appropriate training is required. Divers should prepare for cold water temperatures throughout the year. The habitat supports various temperate freshwater fish and invertebrates typical of the region.

Lago Ritom is a high-altitude freshwater reservoir in the Maggia Valley offering a deep diving experience. The site features a depth range between 20 and 69 metres, with an average depth of 20 metres. Divers access the water via a shore entry. Visibility typically ranges from 5 to 10 metres. Due to the high altitude and cold freshwater temperatures, which remain below 4°C, the use of a dry suit or thick wetsuit is necessary to mitigate the risk of hypothermia. The site is suitable for intermediate divers, with typical dive times around 50 minutes. On-site facilities include parking and toilets.

Sassello is a freshwater reef site located in the Maggia Valley, Switzerland. The reef structure extends from the surface to a depth of 15 metres. Due to the presence of strong currents and rip currents, boat access is required to reach the site safely. Divers must be prepared for variable visibility and cold water conditions, which necessitate advanced buoyancy control and careful navigation. The site presents potential hazards including entanglement risks and overhead environments, requiring thorough pre-dive planning. Given the challenging nature of the currents and the need for precise depth management, this site is suitable for advanced divers only.

Lago del Sambuco-Sassello in the Maggia Valley offers a challenging deep freshwater dive. The site features a significant depth range from 20 to 110 metres, requiring advanced technical diving skills and careful gas management. Visibility typically ranges between 5 and 10 metres. The environment is characterised by extremely cold water, with temperatures between 3°C and 10°C year-round, making drysuit use essential. Divers can expect to encounter typical temperate freshwater fish and invertebrates within the habitat. Shore entry is available, and a cafe is located at the site. Due to the extreme depths and cold, divers must monitor bottom time and ascent rates closely to mitigate the risk of hypothermia and decompression issues.

Lago della Piazza at the Gotthard Hospiz is a high-altitude lake dive located in the Maggia Valley of Switzerland. This shore-entry site offers a controlled environment for divers, with depths ranging between 10 and 20 metres. The water conditions are generally calm with no significant currents, providing a suitable setting for beginner divers to practise buoyancy and navigation. Visibility at the site typically fluctuates between 5 and 10 metres. As facilities are not confirmed on-site, divers should arrive fully prepared with all necessary equipment and air supplies. It is recommended to check locally for current access requirements before planning a visit.

Laghetto Naret is a high-altitude freshwater lake in the Maggia Valley, offering a calm environment for intermediate divers. The site features depths ranging from 20 to 30 metres with visibility typically between 5 and 10 metres. Entry is performed from the shore. Divers should be prepared for cold water temperatures and a pronounced thermocline, which requires the use of a drysuit or a thick, well-sealed wetsuit for adequate thermal protection. As facilities are limited, visitors should plan to be self-sufficient. The lake has no current, allowing for a controlled dive experience in a remote mountain setting.

Laghetti Superiore is a freshwater shore-entry dive located in the Maggia Valley. The site features a reef structure reaching depths of 15 to 20 metres, with an average depth of 17 metres. Visibility is generally good, ranging from 10 to 30 metres, allowing for clear observation of the underwater terrain. Divers can expect a typical dive duration of 40 minutes. Due to the cold water temperatures, adequate thermal protection such as a drysuit or a thick wetsuit is essential for all divers. The site is suitable for beginners, though personal thermal tolerance should be carefully assessed before entering the water.