A major tourist destination, it is mostly accessed through road trips to the seaside village of Sabang from where one of the many Bangkas (Kayaks) take visitors to the park [2] In 2010, a group of environmentalists and geologists discovered that the underground river has a second floor, which means that there are small waterfalls inside the cave.

[citation needed] On November 11, 2011, Puerto Princesa Underground River was provisionally chosen as one of the New 7 Wonders of Nature.

Other plant species include almaciga (Agathis philippinensis), kamagong (Diospyros pulganensis) pandan (Pandanus sp.)

Notable species seen in the park are the blue-naped parrot (Tanygnathus lucionensis), Tabon scrub fowl (Megapodius cumunigii), hill myna (Gracula religiosa), Palawan hornbill (Anthracoceros marchei), white breasted sea eagle (Haliaeetus leucogaster).

[7] Most often observed in the forest canopy and along the shoreline feeding during low tide is the long-tailed macaque (Macaca fascicularis), the only primate found in the area.

[citation needed] Puerto Princesa Underground River was entered as the Philippine entry – and topped the first round of voting – in the New 7 Wonders of Nature competition.

[3] On January 28, 2012, Malacañang expressed elation over the official inclusion of the Puerto Princesa Underground River (PPUR) in the world's New Seven Wonders of Nature.

Throughout the competition, Filipinos from all walks of life have given time, energy, and resources to this campaign," Presidential Spokesperson Edwin Lacierda said.

[10][11] Department of Tourism spokesman and Assistant Secretary Benito Bengzon Jr. said the underground estuary made it into the world's New Seven Wonders of Nature after the validation process conducted by the New7Wonders Foundation last year.

[citation needed] Philippine President Benigno Simeon Aquino III, in his speech during the official proclamation launch of the Puerto Princesa Underground River as one of the 28 finalists, urged the country's 80 million cellphone subscribers to vote PPUR via text.