prehistoric water well made by human in dvaravati civilisation by digging into sand rock at phu phra bat historic park

adventure aged ancient antique archaeological art ban bat big boulder civilisation colour digging dvaravati formation geological heritage highland historic historical history holy huge human into landscape made man massive natural nature old outdoor painting park phra phu phue place pond pool prehistoric red religious remains rock ruin sacred sand shrine site spire stone strange talus thailand thani tourism udon unusual water well