The Longest Navigable Underground River In The World

My husband, me and my friend went here the worlds longest navigable underground river which is located in Palawan, Philippines. It's not alot of tourist in this area because it is kind of far from Manila and where the underground river located is a remote area too. This river features a limestone karst mountain landscape with an 8.2 km. or 5.1 miles long navigable underground river. A distinguishing feature of the river is that it winds through a cave before flowing directly into the South China Sea. The lower portion of the river is subject to tidal influences. The underground river is reputed to be the world's longest. During our tour inside the river we saw different kinds of formations like fruits, church, humans and others. There was alot of bats too and make sure you will not open your mouth when you are looking up if you know what I mean. The tour guide in underground river can speak english, so there is no problem if you are a foreigner. You should visit this one. I had a good time of our tour in here.