Spoilered in case someone hasn't found this area yet.
I'm not sure if this is a bug, or the DEVS way of subtly saying "Don't go there, idiot". But in the Zhentarim Hideout at coordinates X: 283 Y-219 you can see a kind of aqueduct in the cave's background. If you go to the ledge here you can find a series of steps leading down towards the water, then you get to a bit where you can't walk any further, but you can jump to the area where some support beams are. And from there you have the option to jump down into the shallow water on one side, or another patch of ground on the other. I thought this was maybe a secret area like the bit under the Hag's hut and tried exploring. I died. Multiple times. And it's not from fall damage. There's a brief moment after you do the second jump (one one side, the other takes three) that makes it look like the game is loading a new area. But then it immediately cuts to your character's dead prone body lying on the ground.
So I'm not sure if this is a bug preventing access to an area, or if it's an area the DEVS don't want us to go to. But if it's the latter, then having those steps to bait us into going down and giving us the option to jump from a reasonable height seems a bit sadistic. As it should be pretty easy to disable the ability to land a jump there.
