Boating through tam cốc

After a terrifying exit on motorcycle from the capital of Vietnam, we made our way to Ninh Bình, a small city 100km south of Hanoi.  The landscape in this area is made up of steep limestone karst formations that seem to pop out of the rivers and rice fields.  From the nearby Tam Cốc, we took a two hour boat ride along a river that winds through these formations.  The river also took us through caverns that had formed under the mountains.