Faerie Lakes

The fey of freshwater bodies tend toward selfishness a bit more than most, but Seelie fey are decidedly more prominent here than Unseelie.

Among the most innately fleeting of environments, lakes and ponds generally harbor fey with a more mortal-like conception of time unless the body of water in question is especially deep (and thus, long-lasting). This leads them to be less separate from everyday events and more apt to interact with mortals, whether for good or ill.

Greater selfishness and increased awareness of time makes these fey, particularly the Seelie, more dangerous and troublesome than usual, since they are even less likely than most to consider how mortals will react to their activities (even ones they consider kind, such as kidnapping them to attend a blissful feast which lasts a week in Faerie, but much longer in mortal time).