Geologically, The Pages are constituted of phyllites of the BrukungaFormation, formed from metamorphosedCambriansedimentary rocks. The two main islands, lying about 2 kilometres (1.2 mi) apart, are similar in size; North Page is 400 metres (1,300 ft) long, 200 metres (660 ft) wide and 24 metres (79 ft) high, and South Page 450 metres (1,480 ft) long, 170 metres (560 ft) wide and 20 metres (66 ft)high. The reef, south-west of South Page, comprises two adjacent wave-washed islets, rising 1 metre (3 ft 3 in) or so above sea level, with a combined length of 380 metres (1,250 ft). The islands are rugged; they contain no beaches and access by sea is difficult. There is a navigational aid on the top of South Page Island.
The Pages has enjoyed protected area status since 6 May 1900 starting with declaration as part of a Bird Protection District under the Birds Protection Act 1900 followed by declaration as a closed area under the Animals and Birds Protection Act 1919-1938 in 1955, proclamation as a Fauna Reserve under the Fauna Conservation Act 1964-1965 in 1966, proclamation as a Fauna Conservation Reserve under the Crown Lands Act 1929-1967 in 1967, and concluding with proclamation as The Pages Conservation Park following the enactment of the National Parks and Wildlife Act 1972 in 1972.