Trouble with the achievement "Wüstenkenner" in Ashora

[Kaynda]

Hello,

I have troubles completing the achievement "Wüstenkenner" (probably "desert adept" - the one where you have to find the water places in Ashora). I still miss the kelthanas basin. I found it on the map and visited each and every puddle I found at that coords - still not complete. I found 5 artifacts in the meantime (one twice^^) and spend about half an hour searching. Does anyone happen to have the precise coordinates that need to be visited? You should assume that standing waist-deep in water should qualify...

Thanks in advance!

Kaynda

[Slipmat]

Had to look at my achievements to get the English name, it's Desert Knowledge.

try this waypoint for Kelthenas Basin - 4790 6570