Egypt’s Siwa Salt Lakes: why you float instead of sinking

Located near Egypt’s border with Libya, the pools are shaped by the area’s geology and by salt extraction. As minerals are excavated from dried salt lakes, some basins later fill naturally with water from underground springs. In the intense desert climate, water evaporates quickly, leaving behind very high concentrations of mineral salts. That salinity makes the water denser, creating strong buoyancy, so swimmers tend to float on the surface soon after entering.

Some accounts say salt levels in certain pools can rise to extremely high concentrations — far higher than seawater — which further increases buoyancy and makes sinking unlikely.

Beyond their appearance, the Siwa lakes are also linked to the oasis’s long history. Reports note archaeological finds in the region dating back thousands of years. Locally, salt and salt-rich materials have traditionally been used in construction, including in structures such as the historic Shali Fortress.

Today, salt taken from the lakes and ponds is used in a range of products and in wellness practices. Many visitors and locals believe the mineral-rich water can help with skin and sinus problems, though these claims are largely based on tradition and personal experience.

Visitors are commonly advised to be cautious: avoid getting the water into your eyes and avoid shaving right before swimming to reduce irritation.

To reach the lakes, travelers typically book day tours from Cairo or Alexandria or use local transport such as tuk-tuks for shorter trips. Alongside floating in the salt pools, tourists often visit Cleopatra’s Pool, the Oracle Temple, the Shali Fortress area and the Mountain of the Dead tombs. Siwa became more accessible after a highway opened in the 1980s, bringing the once-isolated oasis onto Egypt’s travel map, reports UNB.