Phang Nga Bay is a 400 km2 bay in the Strait of Malacca between the island of Phuket and the mainland of the Malay peninsula of southern Thailand. Since 1981, an extensive section of the bay has been protected as the Ao Phang Nga National Park. The park is in Phang Nga Province, at 08°17'N 098°36'E. Limestone cliffs with caves, collapsed cave systems, and archaeological sites are found about Phang Nga Bay. Around 10,000 years ago, when sea levels were lower, it was possible to walk from Phuket and Krabi.