The story goes that Buddha's mother gave birth to him under a tree in a garden at Lumbini, unable to get back in time to the palace, some 20 km (12 miles) away.
The legend states that it was underwater in a giant oyster is the site of the Buddha's birth. 
mnli hypothesis: The legend states that it was underwater in a giant oyster is the site of the Buddha's birth.  premise: The story goes that Buddha's mother gave birth to him under a tree in a garden at Lumbini, unable to get back in time to the palace, some 20 km (12 miles) away.