Maybe it's due to the lake's depth, but the water in this cove was aqua, 
a noticeably different color than the surrounding water.  The cove's 
water was more aqua while the surrounding water was more a silverish 
blue.  Though subtle, the contrast is visible in this picture.  The 
cove's water covers the right two-thirds of the picture, extending 
nearly to the top of the picture.