Western Dwoisty Lake is one of the Tatra Mountains' most fascinating and unpredictable tarns — a small, shifting body of water that seems to rewrite its own shape with every season. Nestled at just over 1657 m above sea level in the western part of the Gąsienicowa Valley, it rewards curious visitors with a truly unique alpine spectacle.

The lake covers around 0.9 ha and reaches a maximum depth of 7.9 m — but those figures can be deceptive. Water levels here fluctuate by more than 8 metres, meaning the lake's appearance changes dramatically depending on the season. During drier periods, the Western Lake splits into two smaller pools, effectively turning 'Dwoisty' (meaning 'double') into 'Troisty' ('triple'). In severe droughts, both the western and eastern basins fragment further, and the lake beds — covered not in soft mud but in boulders — may be almost fully exposed. In winter, once ice forms and cuts off the shallow inflow, water drains away beneath the ice until the lakes are nearly empty. The lakes are visible from the marked hiking trails leading up to Kościelec peak and over Świnicka Pass towards Świnica — they glitter below the western slopes of Mały Kościelec like scattered mirrors among the rocks and dwarf pine.

• Zakopane / Kuźnice — trail through Gąsienicowa Valley towards Kościelec or Świnicka Pass; the lakes are visible from the trail, but there is no marked path leading directly to them

• The area around the lakes is a strict nature reserve — leaving marked trails is prohibited
• No marked tourist trail runs directly along the lakeshore
• Tatry National Park regulations apply at all times

A remarkable piece of natural history: in 1882, scientists discovered the extremely rare fairy shrimp Branchinecta paludosa here — an Arctic species otherwise found only in the polar zone. Sadly, ill-considered trout stocking in the 1950s and 60s wiped out this population. Tatra National Park has not ruled out a future reintroduction programme.