Water splash sounds in the middle of land

[Alexogan]

In the middle of the land area where there's no water nearby, it sounds like water splashing, like rocks are thrown into water. I tried following the source but seems if i get to it then its left, then it's right, can never get to the direction

[Graf Vigah]

i think its under the map where stones etc fall through the ground

[Saltynips]

it is items falling thru map. ive had it happen and figured it out.

[WarNerve]

I've noticed that it's the same sound that a log makes when it is bobbing up and down the water, or when it falls into the water. As mentioned above, I think it is the sound of logs or rocks and stone falling through the map and hitting water underneath the map.
I know it has nothing to so with this game, but in DayZ, if you fall through the world, you often land in water and can look up through the map. It just reminded me of that, and I find it interesting. =P

[manilla]

Maybe it's an invisible water demon's footsteps.