Basically, the rock the mountain is made out of was harder than the rock that once surrounded it, so the water eroded the soft rock away, leaving the mountain. Alternitavely, there could have been a large amount of debris depositied there by the river, or it could have even been man-made.
Hope I helped :)
yes most mountains are formed under water.
By plates moving apart and north.
Under the Mountain - film - was created on 2009-12-10.
Magic Mountain Water Park was created in 1986.
A mountain range that is completely under water is a mid-ocean ridge.
a volcano
Under the Water was created in 001.
Under the Water-Line was created in 1990.
The Moon Under Water was created in 1946.
Waves under Water was created in 2007.
Wonder under Water was created in 1990.
Horse Under Water was created in 1963.
Life Under Water was created in 1989.
One will sink beneath the other creating under water volcanoes, mountains and trench (I think)