The Minister for the Environment has decided, on the proposal of the municipality of Djúpivogur and with the consent of the landowner of Fagrihvammur, to protect Blábjörg on Berufjarðarströnd in Djúpivogur as a natural monument, pursuant to clause 2, Paragraph 1 of Article 53 of the Nature Conservation Act No. 44/1999.

Blábjörg is a part of a welded tuff layer, or ignimbrite, that has been called Berufjarðartúff (Berufjörður acid tuff). It is just above the Hólmatindstúff, which has lignite, in the strata layers but below the pink tuff layer named after Skessa. Berufjarðartúff can be traced up to the mountains to the northeast and is prominent in Berunestindur for example. It has not been found south of Berufjörður. The ignimbrite was formed in an ash flow during a rhyolite explosive eruption. It is mostly made from melded rhyolite pumice, but basalt rock fragments are also found in it. The mineral chlorite has formed in the transformation of the rock, which gives it a greenish hue.

The nature reserve covers an area of 1.49 hectares. Article 2.

The aim of the protection of Blábjörg as a natural monument is to preserve distinctive geological formations that have high educational and scientific value. Blábjörg is an accessible site to view ignimbrite and is a popular tourist destination.