Bültsee ( da, Bulsø) is a

lake A lake is an area filled with water, localized in a basin, surrounded by land, and distinct from any river or other outlet that serves to feed or drain the lake. Lakes lie on land and are not part of the ocean, although, like the much large ...

Rendsburg-Eckernförde Rendsburg-Eckernförde (; da, Rendsborg-Egernførde) is a district in Schleswig-Holstein, Germany. It is bounded by (from the east and clockwise) the city of Kiel, the district of Plön (district), Plön, the city of Neumünster, the districts of ...

Schleswig-Holstein Schleswig-Holstein (; da, Slesvig-Holsten; nds, Sleswig-Holsteen; frr, Slaswik-Holstiinj) is the northernmost of the 16 states of Germany, comprising most of the historical duchy of Holstein and the southern part of the former Duchy of Sch ...

Germany Germany,, officially the Federal Republic of Germany, is a country in Central Europe. It is the second most populous country in Europe after Russia, and the most populous member state of the European Union. Germany is situated betwe ...

. At an elevation of , its surface area is 0.078 square miles (20.10 ha). The name of the lake is first noted around 1600. The name derives from Old Danish ''bolt'' in the meaning ''round increase'' (cf. indoeuropean. ''*bhel''≈''to swell, to bubble, to be round'').John Kousgård Sørensen: ''Danske sø- og ånavne''. 1, Akademisk forlag København 1968, p. 255

References

Lakes of Schleswig-Holstein Nature reserves in Schleswig-Holstein {{SchleswigHolstein-geo-stub