Hi, i found one dragonshard at the end of the river in the chest and the one more behind the boulders but where is the second one? Searched the caverns but the chests found are all jewelry and random stuff , no shard, plse tell me around where , have search all the places .................

there's another one in the spider nest-- NW corner of the map. you have to find the queen spider and the shard is in a chest behind her

There is another exit from the water cave where you fought the Colanth (you probably exited down through the cave). The other surface exit leads to a jumping lava puzzle. The spider nest is on the other side of that.