Remains of a wooden boat from 7th century, Punjulharjo Village near Lasem, Java island, Indonesia, Southeast Asia, Asia

7th century wooden boat maritime history indonesiann archaeology ancient craftsmanship punjulharjo village lasem java island southeast asia boat remains historical artifact wooden vessel maritime culture culture preservation excavation site heritage ancient trade wooden structure archaeological site craft techniques material culture boat construction shipbuilding cultural artifact ocean navigation historical remains ancient indonesia maritime heritage village history craftsmanship archaeological finds cultural history coastal archaeology ancient engineering vessel remains environmental context historical study maritime technology artifact preservation indonesia history boat relics exhibition heritage conservation ancient transportation cultural significance