Black Virgin Mount

It sounds like you're referring to Black Virgin Mountain, locally called Núi Bà Đen, in Tây Ninh Province, Vietnam. Here's a detailed Núi Bà Đen (literally “Black Virgin Mountain”) is the tallest peak in the Mekong Delta region, rising prominently above the flat surroundings Local Khmer legend speaks of a goddess named Neang Khmau, whose footprints are believed to rest on the rocks Vietnamese tradition ties the site to a tragic love story of a woman named Bà Đen. Today, it is revered by both Buddhists—who have built the Linh Sơn Thiên Thạch Temple about two-thirds up the mountain—and followers of the Cao Dai religion, whose Holy See is nearby interfaithmary.