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Do you know what year range you saw this show, or remember what the characters looked like? I googled "Cartoon Network Shows" and I'm not seeing anything that looks like it matches your description.
I think it was somewhere between 2013-2015, as for the characters the older girl had red hair and was the tallest of the three, the boy had black hair and glasses and the little girl had blonde hair with a pink hat.
Sounds like Gravity Falls, but that was on Disney.
Amazing, I'm looking for the name of this serie too! It's haunting me, did you find it?
My guess is Flint the Time Detective, but that was FOX Kids.
L'île à Lili (French title) ?
https://youtu.be/tUc7eMCfbYQ
Looks like a winner, thanks very much
Oh my goodness, that's it! Thank you so much!
I'm trying to remember the name of this cartoon that I saw on cartoon network, it was about these three siblings, two girls and one boy, where they were camping with their family and the next morning after sleeping in their tent they somehow find themselves in a different world, they try many places that could help them get back home, the oldest sibling carried a diary or a journal, some of the places that they went too included a tribe of small blue gnome, a rock village with Stone golems, pandas who stole fairy wings but gave them back after getting different shades of color.
Edited by Animaltamer