Diogo Island
Encyclopedia
Diogo Island is an uninhabited volcanic island in the province
Provinces of the Philippines
The Provinces of the Philippines are the primary political and administrative divisions of the Philippines. There are 80 provinces at present, further subdivided into component cities and municipalities. The National Capital Region, as well as independent cities, are autonomous from any provincial...

 of Batanes
Batanes
The Province of Batanes , also called the Batanes Islands, is a Philippine province comprising ten islands that are located in the Luzon Strait between the islands of Luzon and Taiwan...

, the northernmost province in the Philippines
Philippines
The Philippines , officially known as the Republic of the Philippines , is a country in Southeast Asia in the western Pacific Ocean. To its north across the Luzon Strait lies Taiwan. West across the South China Sea sits Vietnam...

. Also known as Dinem Island in the native language, Diogo is a lone rock rising out of the sea, with steep cliffs on every side, and dangerous currents make landing there practically impossible. It is an extinct volcano which has suffered heavily from marine erosion.

Geography

Diogo is a small, round island over 1683 feet (513 m) high, about 3/4 mile (0.75 miles (1.2 km)) in diameter, lying 3 1/2 miles (3.5 miles (5.6 km)) southeastward of Itbayat Island
Itbayat Island
Itbayat is one of the Batanes Islands of the Philippines. Together with some other islands it forms the municipality of Itbayat in Batanes Province....

. It is steep on the western side but has several small islets lying off the eastern side, the outermost being nearly 1/2 mile (0.5 mile (0.80467 km)) distant.

Geology

In 1903, Diogo Island was observed to be volcanic, discharging vapor and dark material, but another observation in 1908 believe that those are small clouds which often hang around the mountain. It is listed as an inactive volcano by the Philippine Institute of Volcanology and Seismology
Philippine Institute of Volcanology and Seismology
The Philippine Institute of Volcanology and Seismology is a Philippine national institution dedicated to provide information on the activities of volcanoes, earthquakes and tsunamis, as well as other specialized information and services primarily for the protection of life and property and in...

.

Previous names

In old Spanish maps, the name of the island was listed as Isla Diego or Rodonta.
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