Not sure on the exact levels of mobs there. I know any level 65 caster can solo the shark at the entrance, but that a high 50s group can have difficulty.
In the first room (after you get past the shark) there are 3 alcoves, each containing one or two plants that summon but dont hit too hard. These also will wipe a sub-60 group if you are not careful.
In order to make a trip there worth while you want to have at least a 60 plus group, preferably a full group of 65s.
However, there are some folks who will duo the first room and the area below it, but it is real slow.
The room below that has 4 alcoves, each with a couple of sharks, and I think a couple of wanderers. Either the East or South alcove is a safe place to start (I think south, but cant recall). It is the one without a gate blocking it.
The alcoves have holes in the floors and ceilings which lead to other levels, and there are pirahna which will agro if you get too close to the holes. So avoid the holes until you are ready for a fight with 3 or 4 pirahnas.
Down one of these holes is a trap (or two) that spawn mudcrawlers. These are basically high level renders, very mean. If you dont have a good level 65 group, these will wipe you. You can do them wiht less than a full group, but you have to work really well together.
There are a bunch of named with decent loot in this area, none of them particularly tough.
It is important to note that the pirahnas here hit 6 times each round, and damage shields due huge amounts of damage to them. Down the holes you will find some tougher pirahnas that hit a lot harder than the initial ones, so be careful.
Deeper in there are several raid mobs, as well as a raid event. I have not gone that far, however.
And of course, Kedge Water drops here. I am not sure about the snareweeds in the entrance, but all other mobs do drop Kedge Water. There is lots of demand for this, with someone always buying if you keep an eye on auction.