Q: In this task, you're given a passage, further information available on a particular linked term from the statement, and an answer term. Your job is to generate a question that can use the information provided to obtain the given answer. You should use the information on both passage and link information to create the question. Note that the answer to the question should be exactly the given answer, and if the answer is none, the answer to the question shouldn't be obtainable from the passage or linked information.
Passage: During the last ice age, the peninsula was connected by an isthmus to the island of Mindanao in the Philippines with the former isthmus included what is now the active volcanic island of Jolo, located at . In the peninsula also located the Skull Hill (Bukit Tengkorak) which consisted largely of numerous isolated hills and mountains, mostly being an extinct volcanoes from the era of Pliocene to Quaternary. Based on survey by Geological Department of Kota Kinabalu, the Skull Hill is said to be an island in its previous form but since the coral limestone terrace of the peninsula have risen from between 100 metres to 130 metres in the past 20,000 years, the hill are not island but a mountainous ridge near the coast. Through a survey on the geothermal presence in the peninsula, the area have a potential to develop geothermal energy as part of the Sabah's renewable energy. The narrow continental shelf fronting the coastal areas of both Dent and Semporna Peninsulas also could be exposed to future tsunamis with the active fault in the eastern coast.
Link Information: none Answer: none
A:
Which country today is closest to the Philippine island that was once connected Semporna peninsula?