This video gives an idea on how the eruption has evolved and what it looks like in May 2021.

Fagradalsfjall is a shield volcano on the Reykjanes Peninsula, around 40 kilometers from Reykjavík, Iceland. Its highest summit is Langhóll. A volcanic eruption began on 19 March 2021 in Geldingadalir to the south of Fagradalsfjall, which is still emitting fresh lava as of 1 June 2021.

Eruption fissures in Geldingadalir
On 19 March 2021, an effusive eruption started at approximately 8:45 PM local time in Geldingadalir "gelding valleys", the singular "Geldingadalur" is also often used, to the south of Fagradalsfjall, the first known eruption on the peninsula in about 800 years. Fagradalsfjall has been dormant for 6,000 years. The eruptive activity was first announced by the Icelandic Meteorological Office at 9:40 PM. Reports state a 600–700-metre-long (2,000–2,300 ft) fissure vent began ejecting lava, which covered an area of less than 1 square kilometer (0.39 sq mi). Currently, the lava flows pose no threat to residents, as the area is mostly uninhabited, although there is potential for sulfur dioxide pollution

The eruption has been called Geldingadalsgos "Geldingadalur eruption". As of 26 March, the main eruptive vent was at 63.8889 N, 22.2704 W, on the site of a previous eruptive mound. The eruption may be a shield volcano eruption, which may last for several years. It is visible from the suburbs of the capital city of Reykjavík and has attracted a large number of visitors. However, high levels of volcanic gases such as carbon dioxide and carbon monoxide make parts of the area inaccessible.