It lies in the Ústí nad Labem Region, in the northern part of the territory of the city of Most.

The lake is located in the area of the former historic town of Most, which was demolished in the 1970s to make room for the Ležáky lignite mine.

The area affected by the mining activity was revitalized by the state company Palivový kombinát Ústí.

In addition to that there were also delays in regards to the construction of the floating piers and other components which were to be the basis of the integrated emergency system.

The lake was officially opened to the public on 12 September 2020, albeit without celebrations due to the COVID-19 crisis, because of which the Most festivities were also cancelled.

The original intent from 2002 relied on setting up the Bílina River as the water source, however after further inspection by the regional sanitation station the river was deemed unfit due to a high degree of water pollution.

[1] The year 2016 was warmer than expected and as such the lake didn't intake enough water naturally, thus it was filled up again from the Ohře river, which turned out expensive.

The lake costs 20 million CZK annually, and up to half of this amount can be expenses on securing the water intake from the Ohře.