River (OA)

You can swim with great skill (though you cannot breathe water without further magical assistance). You have a base swimming speed of 30 feet. You do not need to make Swim checks to swim normally. You gain a +8 bonus on any Swim check to perform some special action or avoid a hazard, and you can always choose to take 10 on these checks, even if rushed or threatened when swimming. You can use the run action while swimming, provided you swim in a straight line.