Monti's Riddles

What am I?

I am a vast sea of rocks, yet nobody swims me.

I am a turtle who came to die upon a river bank in

early April and now, in late June is covered by moss.

No one could move me if they tried. The clouds around

me are dust on an anthill.

My many rivers are fudge sauce on an ice cream sundae

toppling off to the the bottom of the bowl. As a city

provides shelter for people, I furnish a haven for

animals. I am not humane for I have a cruel set of

rules...

What am I?