What is "fensalir"

In Norse mythology, Fensalir ( Old Norse " Fen Halls") is a location where the goddess Frigg dwells. Fensalir is attested in the Poetic Edda, compiled in the 13th century from earlier traditional sources, and the Prose Edda, written in the 13th century by Snorri Sturluson. Scholars have proposed theories about the implications of the location, including that the location may have some connection to religious practices involving springs, bogs, or swamps in Norse paganism, and that it may be connected to the goddess Sága's watery location Sökkvabekkr.