I'm seeing a rather harsh edge on water in the distance like in this http://cloud.steampowered.com/ugc/576677966552034125/89D26432DD3D9506FBEF7310229DD77727E79C83/. You'll see it right above my crosshair. It's not very noticeable now, but becomes more noticeable when look at water from higher up. I was wondering if there's any way to fix this.

My system has an Athlon 64 X2 2.7 GHz, with 4 GB RAM and a Radeon 3870 graphics card.
I'm running the game on Windows 7 64 through Steam.